diff --git a/src/stores/chat/__tests__/chat-machine.helpers.test.ts b/src/stores/chat/__tests__/chat-machine.helpers.test.ts
index 60b572b9..4df4158e 100644
--- a/src/stores/chat/__tests__/chat-machine.helpers.test.ts
+++ b/src/stores/chat/__tests__/chat-machine.helpers.test.ts
@@ -40,9 +40,6 @@ function makeChatState(overrides: Partial<ChatState> = {}): ChatState {
     creditsCharged: 0,
     requiredCredits: 0,
     shortfallCredits: 0,
-    isLoadingMore: false,
-    hasMore: true,
-    historyOffset: 0,
     historyLoaded: true,
     paymentUnlockPending: false,
     unlockHistoryPromptVisible: false,
diff --git a/src/stores/chat/__tests__/chat-machine.transitions.test.ts b/src/stores/chat/__tests__/chat-machine.transitions.test.ts
index 4a005878..f980beeb 100644
--- a/src/stores/chat/__tests__/chat-machine.transitions.test.ts
+++ b/src/stores/chat/__tests__/chat-machine.transitions.test.ts
@@ -13,12 +13,6 @@ import type {
   UnlockMessageRequest,
 } from "@/stores/chat/chat-machine.helpers";
 
-interface LoadMoreHistoryOutput {
-  messages: UiMessage[];
-  hasMore: boolean;
-  newOffset: number;
-}
-
 interface SendMessageHttpOutput {
   response: ChatSendResponse;
   reply: UiMessage | null;
@@ -29,8 +23,6 @@ interface UnlockHistoryOutput {
   reason: string;
   shortfallCredits: number;
   messages: UiMessage[];
-  hasMore: boolean;
-  newOffset: number;
 }
 
 interface TestUnlockMessageOutput {
@@ -83,13 +75,6 @@ function createTestChatMachine(
   return chatMachine.provide({
     actors: {
       loadHistory: createLoadHistoryCallback(options.historyMessages ?? []),
-      loadMoreHistory: fromPromise<LoadMoreHistoryOutput, { offset: number }>(
-        async () => ({
-          messages: [],
-          hasMore: false,
-          newOffset: 0,
-        }),
-      ),
       sendMessageHttp: fromPromise<
         SendMessageHttpOutput,
         { content: string }
@@ -116,8 +101,6 @@ function createTestChatMachine(
         reason: "ok",
         shortfallCredits: 0,
         messages: [],
-        hasMore: false,
-        newOffset: 0,
         ...options.unlockHistoryOutput,
       })),
       unlockMessage: fromPromise<
@@ -147,8 +130,6 @@ function createLoadHistoryCallback(
       type: "ChatLocalHistoryLoaded",
       output: {
         messages,
-        hasMore: false,
-        newOffset: messages.length,
         localCount: messages.length,
       },
     });
@@ -156,8 +137,6 @@ function createLoadHistoryCallback(
       type: "ChatNetworkHistoryLoaded",
       output: {
         messages: networkMessages,
-        hasMore: false,
-        newOffset: networkMessages.length,
         localOverwritten: true,
         localCount: messages.length,
         networkCount: networkMessages.length,
@@ -283,8 +262,6 @@ describe("chatMachine transitions", () => {
             type: "ChatLocalHistoryLoaded",
             output: {
               messages: [localMessage],
-              hasMore: false,
-              newOffset: 1,
               localCount: 1,
             },
           });
@@ -293,8 +270,6 @@ describe("chatMachine transitions", () => {
               type: "ChatNetworkHistoryLoaded",
               output: {
                 messages: [networkMessage],
-                hasMore: false,
-                newOffset: 1,
                 localOverwritten: true,
                 localCount: 1,
                 networkCount: 1,
@@ -399,13 +374,6 @@ describe("chatMachine transitions", () => {
     const machine = chatMachine.provide({
       actors: {
         loadHistory: createLoadHistoryCallback([]),
-        loadMoreHistory: fromPromise<LoadMoreHistoryOutput, { offset: number }>(
-          async () => ({
-            messages: [],
-            hasMore: false,
-            newOffset: 0,
-          }),
-        ),
         sendMessageHttp: fromPromise<
           SendMessageHttpOutput,
           { content: string }
@@ -435,8 +403,6 @@ describe("chatMachine transitions", () => {
           reason: "ok",
           shortfallCredits: 0,
           messages: [],
-          hasMore: false,
-          newOffset: 0,
         })),
       },
     });
@@ -526,8 +492,6 @@ describe("chatMachine transitions", () => {
               lockReason: null,
             },
           ],
-          hasMore: false,
-          newOffset: 1,
         },
       }),
     ).start();
@@ -585,8 +549,6 @@ describe("chatMachine transitions", () => {
               lockReason: null,
             },
           ],
-          hasMore: false,
-          newOffset: 1,
         },
       }),
     ).start();
diff --git a/src/stores/chat/chat-context.tsx b/src/stores/chat/chat-context.tsx
index a2b43883..6e2cd78d 100644
--- a/src/stores/chat/chat-context.tsx
+++ b/src/stores/chat/chat-context.tsx
@@ -26,9 +26,6 @@ interface ChatState {
   isReplyingAI: boolean;
   upgradePromptVisible: boolean;
   upgradeReason: MachineContext["upgradeReason"];
-  isLoadingMore: boolean;
-  hasMore: boolean;
-  historyOffset: number;
   /** history 初始加载完成标志（local → network → save 跑完） —— UI 可用此显示 loading */
   historyLoaded: boolean;
   unlockHistoryPromptVisible: boolean;
@@ -63,9 +60,6 @@ export function ChatProvider({ children }: ChatProviderProps) {
       isReplyingAI: state.context.isReplyingAI,
       upgradePromptVisible: state.context.upgradePromptVisible,
       upgradeReason: state.context.upgradeReason,
-      isLoadingMore: state.context.isLoadingMore,
-      hasMore: state.context.hasMore,
-      historyOffset: state.context.historyOffset,
       historyLoaded: state.context.historyLoaded,
       unlockHistoryPromptVisible: state.context.unlockHistoryPromptVisible,
       lockedHistoryCount: state.context.lockedHistoryCount,
diff --git a/src/stores/chat/chat-events.ts b/src/stores/chat/chat-events.ts
index e9db2510..bf50d502 100644
--- a/src/stores/chat/chat-events.ts
+++ b/src/stores/chat/chat-events.ts
@@ -36,7 +36,6 @@ export type ChatEvent =
   // 业务事件
   | { type: "ChatSendMessage"; content: string }
   | { type: "ChatSendImage"; imageBase64: string }
-  | { type: "ChatLoadMoreHistory" }
   | {
       type: "ChatPromotionInjected";
       promotion: PendingChatPromotion;
diff --git a/src/stores/chat/chat-history-flow.ts b/src/stores/chat/chat-history-flow.ts
index ca333fa9..453bfd2e 100644
--- a/src/stores/chat/chat-history-flow.ts
+++ b/src/stores/chat/chat-history-flow.ts
@@ -1,24 +1,16 @@
-import { fromCallback, fromPromise } from "xstate";
+import { fromCallback } from "xstate";
 
-import { getChatRepository } from "@/data/repositories/chat_repository";
-import { resolveChatCacheOwnerKey } from "@/data/repositories/chat_cache_identity";
-import { Logger, Result } from "@/utils";
+import { Logger } from "@/utils";
 
 import {
   readLocalHistorySnapshot,
   resolveHistoryCacheIdentity,
   syncNetworkHistory,
 } from "./chat-history-sync";
-import {
-  PAGE_SIZE,
-  localMessagesToUi,
-} from "./chat-machine.helpers";
 import type { ChatEvent } from "./chat-events";
 
 const log = new Logger("StoresChatChatHistoryFlow");
 
-type UiMessage = import("@/data/dto/chat").UiMessage;
-
 export const loadHistoryActor = fromCallback<ChatEvent>(({ sendBack }) => {
   let cancelled = false;
 
@@ -50,30 +42,3 @@ export const loadHistoryActor = fromCallback<ChatEvent>(({ sendBack }) => {
     cancelled = true;
   };
 });
-
-export const loadMoreHistoryActor = fromPromise<
-  { messages: UiMessage[]; hasMore: boolean; newOffset: number },
-  { offset: number }
->(async ({ input }) => {
-  const chatRepo = getChatRepository();
-  const cacheIdentityResult = await resolveChatCacheOwnerKey();
-  const result = await chatRepo.getHistory(PAGE_SIZE, input.offset);
-  if (Result.isErr(result)) {
-    log.error("[chat-machine] loadMoreHistoryActor failed", {
-      error: result.error,
-    });
-    throw result.error;
-  }
-  const page = localMessagesToUi(result.data.messages);
-  if (Result.isOk(cacheIdentityResult)) {
-    void chatRepo.prefetchMediaForMessages(
-      result.data.messages,
-      cacheIdentityResult.data,
-    );
-  }
-  return {
-    messages: page,
-    hasMore: page.length >= PAGE_SIZE,
-    newOffset: input.offset + page.length,
-  };
-});
diff --git a/src/stores/chat/chat-history-sync.ts b/src/stores/chat/chat-history-sync.ts
index bc774cb3..85870c03 100644
--- a/src/stores/chat/chat-history-sync.ts
+++ b/src/stores/chat/chat-history-sync.ts
@@ -3,15 +3,16 @@ import { resolveChatCacheOwnerKey } from "@/data/repositories/chat_cache_identit
 import { getChatRepository } from "@/data/repositories/chat_repository";
 import { Logger, Result, todayString } from "@/utils";
 
-import { localMessagesToUi, PAGE_SIZE } from "./chat-machine.helpers";
+import {
+  CHAT_HISTORY_LIMIT,
+  localMessagesToUi,
+} from "./chat-machine.helpers";
 
 const log = new Logger("StoresChatChatHistorySync");
 
 export type ReadAndSyncHistoryOutput = {
   /** Network-authoritative messages. Empty network history includes a UI greeting. */
   messages: UiMessage[];
-  hasMore: boolean;
-  newOffset: number;
   /** True when network history was written back to local storage. */
   localOverwritten: boolean;
   localCount: number;
@@ -21,8 +22,6 @@ export type ReadAndSyncHistoryOutput = {
 export type LocalHistorySnapshotOutput = {
   /** Local cached messages. Empty local history includes a UI greeting. */
   messages: UiMessage[];
-  hasMore: boolean;
-  newOffset: number;
   localCount: number;
 };
 
@@ -69,8 +68,6 @@ export async function readLocalHistorySnapshot(
 
   return {
     messages: snapshotMessages,
-    hasMore: localMessages.length >= PAGE_SIZE,
-    newOffset: snapshotMessages.length,
     localCount: localMessages.length,
   };
 }
@@ -82,7 +79,7 @@ export async function syncNetworkHistory(
   const chatRepo = getChatRepository();
   const greetingMessage = createGreetingMessage();
 
-  const networkResult = await chatRepo.getHistory(PAGE_SIZE, 0);
+  const networkResult = await chatRepo.getHistory(CHAT_HISTORY_LIMIT, 0);
   if (Result.isErr(networkResult)) {
     log.error("[chat-machine] loadHistory NETWORK FAILED", {
       error: networkResult.error,
@@ -120,8 +117,6 @@ export async function syncNetworkHistory(
 
   return {
     messages: finalMessages,
-    hasMore: finalMessages.length >= PAGE_SIZE,
-    newOffset: finalMessages.length,
     localOverwritten,
     localCount,
     networkCount: networkUi.length,
@@ -145,8 +140,6 @@ export async function readAndSyncHistory(): Promise<ReadAndSyncHistoryOutput> {
 
   return {
     messages: localSnapshot.messages,
-    hasMore: localSnapshot.hasMore,
-    newOffset: localSnapshot.newOffset,
     localOverwritten: false,
     localCount: localSnapshot.localCount,
     networkCount: 0,
diff --git a/src/stores/chat/chat-machine.actors.ts b/src/stores/chat/chat-machine.actors.ts
index fb95a382..d2413ff0 100644
--- a/src/stores/chat/chat-machine.actors.ts
+++ b/src/stores/chat/chat-machine.actors.ts
@@ -6,10 +6,7 @@
  * - chat-send-flow
  * - chat-unlock-flow
  */
-export {
-  loadHistoryActor,
-  loadMoreHistoryActor,
-} from "./chat-history-flow";
+export { loadHistoryActor } from "./chat-history-flow";
 export {
   httpMessageQueueActor,
   sendMessageHttpActor,
diff --git a/src/stores/chat/chat-machine.helpers.ts b/src/stores/chat/chat-machine.helpers.ts
index d934aa2f..c57b6e04 100644
--- a/src/stores/chat/chat-machine.helpers.ts
+++ b/src/stores/chat/chat-machine.helpers.ts
@@ -2,8 +2,8 @@ import type { UiMessage } from "@/data/dto/chat";
 
 import type { ChatState } from "./chat-state";
 
-// History pagination size used by the history actors.
-export const PAGE_SIZE = 50;
+// The initial history request remains bounded even though pagination is disabled.
+export const CHAT_HISTORY_LIMIT = 50;
 
 export * from "./chat-message-mappers";
 export * from "./chat-promotion";
@@ -13,17 +13,10 @@ export * from "./chat-unlock-helpers";
 export function applyHistoryLoadedOutput(
   output: {
     messages: UiMessage[];
-    hasMore: boolean;
-    newOffset: number;
   },
-): Pick<
-  ChatState,
-  "messages" | "hasMore" | "historyOffset" | "historyLoaded"
-> {
+): Pick<ChatState, "messages" | "historyLoaded"> {
   return {
     messages: output.messages,
-    hasMore: output.hasMore,
-    historyOffset: output.newOffset,
     historyLoaded: true,
   };
 }
@@ -32,18 +25,13 @@ export function applyNetworkHistoryLoadedOutput(
   context: ChatState,
   output: {
     messages: UiMessage[];
-    hasMore: boolean;
-    newOffset: number;
+    localCount: number;
   },
-): Pick<
-  ChatState,
-  "messages" | "hasMore" | "historyOffset" | "historyLoaded"
-> {
-  const optimisticTail = context.messages.slice(context.historyOffset);
+): Pick<ChatState, "messages" | "historyLoaded"> {
+  const localSnapshotSize = output.localCount === 0 ? 1 : output.localCount;
+  const optimisticTail = context.messages.slice(localSnapshotSize);
   return {
     messages: [...output.messages, ...optimisticTail],
-    hasMore: output.hasMore,
-    historyOffset: output.newOffset,
     historyLoaded: true,
   };
 }
diff --git a/src/stores/chat/chat-machine.ts b/src/stores/chat/chat-machine.ts
index de3b6990..d4047bbe 100644
--- a/src/stores/chat/chat-machine.ts
+++ b/src/stores/chat/chat-machine.ts
@@ -39,10 +39,7 @@ import {
   shouldPromptUnlockHistory,
   createChatPromotionState,
 } from "./chat-machine.helpers";
-import {
-  loadHistoryActor,
-  loadMoreHistoryActor,
-} from "./chat-history-flow";
+import { loadHistoryActor } from "./chat-history-flow";
 import {
   appendGuestUserImageAction,
   appendUserImageAction,
@@ -87,7 +84,6 @@ export const chatMachine = setup({
   },
   actors: {
     loadHistory: loadHistoryActor,
-    loadMoreHistory: loadMoreHistoryActor,
     sendMessageHttp: sendMessageHttpActor,
     httpMessageQueue: httpMessageQueueActor,
     unlockHistory: unlockHistoryActor,
@@ -154,7 +150,6 @@ export const chatMachine = setup({
       if (event.type !== "ChatNetworkHistoryLoaded") return {};
       return {
         ...applyNetworkHistoryLoadedOutput(context, event.output),
-        isLoadingMore: false,
         paymentUnlockPending: false,
       };
     }),
@@ -167,7 +162,6 @@ export const chatMachine = setup({
       );
       return {
         ...nextHistory,
-        isLoadingMore: false,
         paymentUnlockPending: false,
         unlockHistoryPromptVisible: true,
         lockedHistoryCount: countLockedHistoryMessages(nextHistory.messages),
@@ -175,10 +169,7 @@ export const chatMachine = setup({
       };
     }),
 
-    markHistoryLoadFailed: assign({
-      isLoadingMore: false,
-      historyLoaded: true,
-    }),
+    markHistoryLoadFailed: assign({ historyLoaded: true }),
   },
 }).createMachine({
   id: "chat",
@@ -404,9 +395,6 @@ export const chatMachine = setup({
             ChatSendImage: {
               actions: "appendUserImage",
             },
-            ChatLoadMoreHistory: {
-              target: "loadingMore",
-            },
             ChatUnlockMessageRequested: {
               guard: ({ event }) => event.messageId.trim().length > 0,
               target: "unlockingMessage",
@@ -432,25 +420,6 @@ export const chatMachine = setup({
             },
           },
         },
-        loadingMore: {
-          invoke: {
-            src: "loadMoreHistory",
-            input: ({ context }) => ({ offset: context.historyOffset }),
-            onDone: {
-              target: "ready",
-              actions: assign(({ context, event }) => ({
-                messages: [...event.output.messages, ...context.messages],
-                isLoadingMore: false,
-                hasMore: event.output.hasMore,
-                historyOffset: event.output.newOffset,
-              })),
-            },
-            onError: {
-              target: "ready",
-              actions: assign({ isLoadingMore: false }),
-            },
-          },
-        },
         unlockingHistory: {
           invoke: {
             id: "unlockHistory",
@@ -466,8 +435,6 @@ export const chatMachine = setup({
                   event.output.reason === "insufficient_balance";
                 return {
                   messages: event.output.messages,
-                  hasMore: event.output.hasMore,
-                  historyOffset: event.output.newOffset,
                   historyLoaded: true,
                   paymentUnlockPending: false,
                   unlockHistoryPromptVisible: insufficientBalance,
diff --git a/src/stores/chat/chat-state.ts b/src/stores/chat/chat-state.ts
index db51ec58..cd34cfee 100644
--- a/src/stores/chat/chat-state.ts
+++ b/src/stores/chat/chat-state.ts
@@ -31,13 +31,7 @@ export interface ChatState {
   creditsCharged: number;
   requiredCredits: number;
   shortfallCredits: number;
-  isLoadingMore: boolean;
-  hasMore: boolean;
-  historyOffset: number;
-  /** history 首屏可展示标志（本地快照加载完成即可进入 ready）
-   * - 网络历史加载完成后会再次刷新消息列表
-   * - 不被 `loadMoreHistoryActor` 设置（翻页是另一码事）
-   */
+  /** history 首屏可展示标志（本地快照加载完成即可进入 ready）。 */
   historyLoaded: boolean;
   paymentUnlockPending: boolean;
   unlockHistoryPromptVisible: boolean;
@@ -66,9 +60,6 @@ export const initialState: ChatState = {
   creditsCharged: 0,
   requiredCredits: 0,
   shortfallCredits: 0,
-  isLoadingMore: false,
-  hasMore: true,
-  historyOffset: 0,
   historyLoaded: false,
   paymentUnlockPending: false,
   unlockHistoryPromptVisible: false,
diff --git a/src/stores/chat/chat-unlock-flow.ts b/src/stores/chat/chat-unlock-flow.ts
index 2be6fddb..0f19e5e3 100644
--- a/src/stores/chat/chat-unlock-flow.ts
+++ b/src/stores/chat/chat-unlock-flow.ts
@@ -27,8 +27,6 @@ export const unlockHistoryActor = fromPromise<{
   reason: string;
   shortfallCredits: number;
   messages: UiMessage[];
-  hasMore: boolean;
-  newOffset: number;
 }>(async () => {
   const chatRepo = getChatRepository();
   const unlockResult = await chatRepo.unlockHistory();
@@ -45,8 +43,6 @@ export const unlockHistoryActor = fromPromise<{
     reason: unlockResult.data.reason,
     shortfallCredits: unlockResult.data.shortfallCredits,
     messages: history.messages,
-    hasMore: history.hasMore,
-    newOffset: history.newOffset,
   };
 });