diff --git a/apps/kimi-web/src/components/Composer.vue b/apps/kimi-web/src/components/Composer.vue
index defa09d61..547501b48 100644
--- a/apps/kimi-web/src/components/Composer.vue
+++ b/apps/kimi-web/src/components/Composer.vue
@@ -328,6 +328,7 @@ onUnmounted(() => {
   for (const att of attachments.value) {
     revokeAttachment(att);
   }
+  clearCompositionEndTimer();
 });
 
 // ---------------------------------------------------------------------------
@@ -422,7 +423,36 @@ function handleSteer(): void {
   emit('steer', payload);
 }
 
+let isComposingText = false;
+let compositionEndTimer: ReturnType<typeof setTimeout> | null = null;
+
+function clearCompositionEndTimer(): void {
+  if (compositionEndTimer !== null) {
+    clearTimeout(compositionEndTimer);
+    compositionEndTimer = null;
+  }
+}
+
+function handleCompositionStart(): void {
+  clearCompositionEndTimer();
+  isComposingText = true;
+}
+
+function handleCompositionEnd(): void {
+  clearCompositionEndTimer();
+  compositionEndTimer = setTimeout(() => {
+    compositionEndTimer = null;
+    isComposingText = false;
+  }, 0);
+}
+
+function isComposingKeyEvent(e: KeyboardEvent): boolean {
+  return isComposingText || e.isComposing || e.keyCode === 229;
+}
+
 function handleKeydown(e: KeyboardEvent): void {
+  if (isComposingKeyEvent(e)) return;
+
   // Close dropdowns on Escape
   if (e.key === 'Escape') {
     if (dropdownOpen.value) {
@@ -729,6 +759,8 @@ function selectModel(modelId: string): void {
             :placeholder="placeholder"
             rows="1"
             @keydown="handleKeydown"
+            @compositionstart="handleCompositionStart"
+            @compositionend="handleCompositionEnd"
             @input="handleInput"
           />
 
diff --git a/apps/kimi-web/test/composer.test.ts b/apps/kimi-web/test/composer.test.ts
new file mode 100644
index 000000000..c00176136
--- /dev/null
+++ b/apps/kimi-web/test/composer.test.ts
@@ -0,0 +1,65 @@
+import { mount } from '@vue/test-utils';
+import { createI18n } from 'vue-i18n';
+import { afterEach, describe, expect, it } from 'vitest';
+import Composer from '../src/components/Composer.vue';
+
+function mountComposer() {
+  const i18n = createI18n({
+    legacy: false,
+    locale: 'en',
+    messages: {
+      en: {
+        composer: {
+          interrupt: 'Interrupt',
+          interruptTitle: 'Interrupt',
+          placeholder: 'Message Kimi',
+          send: 'Send',
+        },
+      },
+    },
+  });
+
+  return mount(Composer, {
+    global: {
+      plugins: [i18n],
+    },
+  });
+}
+
+function waitForCompositionEndTimer(): Promise<void> {
+  return new Promise((resolve) => setTimeout(resolve, 0));
+}
+
+afterEach(() => {
+  document.body.innerHTML = '';
+});
+
+describe('Composer IME input', () => {
+  it('does not submit when Enter confirms active composition', async () => {
+    const wrapper = mountComposer();
+    const textarea = wrapper.get('textarea');
+
+    await textarea.setValue('ni');
+    await textarea.trigger('compositionstart');
+    await textarea.trigger('keydown', { key: 'Enter', isComposing: true });
+
+    expect(wrapper.emitted('submit')).toBeUndefined();
+  });
+
+  it('does not submit the Enter that immediately follows compositionend', async () => {
+    const wrapper = mountComposer();
+    const textarea = wrapper.get('textarea');
+
+    await textarea.setValue('你好');
+    await textarea.trigger('compositionstart');
+    await textarea.trigger('compositionend');
+    await textarea.trigger('keydown', { key: 'Enter', isComposing: false });
+
+    expect(wrapper.emitted('submit')).toBeUndefined();
+
+    await waitForCompositionEndTimer();
+    await textarea.trigger('keydown', { key: 'Enter', isComposing: false });
+
+    expect(wrapper.emitted('submit')).toEqual([[{ text: '你好', attachments: [] }]]);
+  });
+});