diff --git a/frontend/src/composables/useReaderAutoPlayback.test.ts b/frontend/src/composables/useReaderAutoPlayback.test.ts
new file mode 100644
index 0000000..d660b91
--- /dev/null
+++ b/frontend/src/composables/useReaderAutoPlayback.test.ts
@@ -0,0 +1,110 @@
+import { computed, ref } from 'vue'
+import { describe, expect, it, vi } from 'vitest'
+import { useReaderAutoPlayback } from './useReaderAutoPlayback'
+
+describe('useReaderAutoPlayback', () => {
+  it('starts speech when chapter HTML contains br elements without paragraphs', () => {
+    const chapterText = fakeElement('第一段\n第二段', [], '第一段<br>第二段')
+    const scrollContainer = fakeElement('')
+    const originalHtml = chapterText.innerHTML
+    const startTTS = vi.fn()
+    const store = {
+      speechConfig: {
+        provider: 'openai',
+        openaiRequestMode: 'chunked',
+      },
+      currentIndex: 0,
+      hasNext: false,
+      hasPrev: false,
+      isPaused: false,
+      isAutoScrolling: false,
+      startTTS,
+      preloadOpenAITTS: vi.fn(),
+      stopTTS: vi.fn(),
+    } as unknown as Parameters<typeof useReaderAutoPlayback>[0]
+
+    const playback = useReaderAutoPlayback(
+      store,
+      computed(() => ({
+        autoPageMode: 'pixel',
+        clickAction: 'none',
+        scrollPixel: 1,
+        pageSpeed: 1_000,
+        fontSize: 16,
+        lineHeight: 1.5,
+      })),
+      computed(() => false),
+      ref(scrollContainer),
+      ref(chapterText),
+      vi.fn(),
+      vi.fn(),
+    )
+
+    playback.startSpeech()
+
+    expect(startTTS).toHaveBeenCalledTimes(1)
+    expect(startTTS.mock.calls[0]?.[0]).toContain('第一段')
+    expect(chapterText.innerHTML).toBe(originalHtml)
+  })
+
+  it('keeps paragraph elements as separate speech targets when they exist', () => {
+    const firstParagraph = fakeElement('第一段')
+    const secondParagraph = fakeElement('第二段')
+    const chapterText = fakeElement('第一段\n第二段', [firstParagraph, secondParagraph])
+    const scrollContainer = fakeElement('')
+    const startTTS = vi.fn()
+    const store = {
+      speechConfig: {
+        provider: 'system',
+        openaiRequestMode: 'chunked',
+      },
+      currentIndex: 0,
+      hasNext: false,
+      hasPrev: false,
+      isPaused: false,
+      isAutoScrolling: false,
+      startTTS,
+      preloadOpenAITTS: vi.fn(),
+      stopTTS: vi.fn(),
+    } as unknown as Parameters<typeof useReaderAutoPlayback>[0]
+
+    const playback = useReaderAutoPlayback(
+      store,
+      computed(() => ({
+        autoPageMode: 'pixel',
+        clickAction: 'none',
+        scrollPixel: 1,
+        pageSpeed: 1_000,
+        fontSize: 16,
+        lineHeight: 1.5,
+      })),
+      computed(() => false),
+      ref(scrollContainer),
+      ref(chapterText),
+      vi.fn(),
+      vi.fn(),
+    )
+
+    playback.startSpeech()
+
+    expect(startTTS).toHaveBeenCalledTimes(1)
+    expect(startTTS.mock.calls[0]?.[0]).toBe('第一段')
+  })
+})
+
+function fakeElement(innerText: string, paragraphs: HTMLElement[] = [], innerHTML = '') {
+  return {
+    innerText,
+    innerHTML,
+    offsetTop: 0,
+    offsetHeight: 20,
+    scrollTop: 0,
+    classList: {
+      add: vi.fn(),
+      remove: vi.fn(),
+    },
+    querySelector: vi.fn(() => null),
+    querySelectorAll: vi.fn((selector: string) => selector === 'p' ? paragraphs : []),
+    scrollTo: vi.fn(),
+  } as unknown as HTMLElement
+}
diff --git a/frontend/src/composables/useReaderAutoPlayback.ts b/frontend/src/composables/useReaderAutoPlayback.ts
index 6ef24ec..b871ecc 100644
--- a/frontend/src/composables/useReaderAutoPlayback.ts
+++ b/frontend/src/composables/useReaderAutoPlayback.ts
@@ -54,7 +54,11 @@ export function useReaderAutoPlayback(
       ? Array.from(scrollContainerRef.value?.querySelectorAll('.chapter-text[data-role="continuous"]') || []) as HTMLElement[]
       : (chapterTextRef.value ? [chapterTextRef.value] : [])
     if (!roots.length) return [] as HTMLElement[]
-    const allElements = roots.flatMap((root) => Array.from(root.querySelectorAll('p')) as HTMLElement[])
+    const allElements = roots.flatMap((root) => {
+      const paragraphs = Array.from(root.querySelectorAll('p')) as HTMLElement[]
+      if (paragraphs.length) return paragraphs
+      return root.innerText.trim() ? [root] : []
+    })
     const list: HTMLElement[] = []
     let lastText = ''
     allElements.forEach((el) => {