diff --git a/feature_capabilities/Index.ets b/feature_capabilities/Index.ets
index 99b9f51..8f34c47 100644
--- a/feature_capabilities/Index.ets
+++ b/feature_capabilities/Index.ets
@@ -23,3 +23,6 @@ export { NavProvider } from './src/main/ets/providers/NavProvider';
 
 // 微信 SDK 封装（EntryAbility 处理回调 want 需用）
 export { WeChatApi, WX_APP_ID } from './src/main/ets/wx/WeChatApi';
+
+// 分享文本拼接纯函数（供单测）
+export { buildShareText } from './src/main/ets/share/ShareText';
diff --git a/feature_capabilities/src/main/ets/share/ShareText.ets b/feature_capabilities/src/main/ets/share/ShareText.ets
new file mode 100644
index 0000000..4b809b3
--- /dev/null
+++ b/feature_capabilities/src/main/ets/share/ShareText.ets
@@ -0,0 +1,14 @@
+/**
+ * 分享文本拼接（纯函数，可单测）。
+ * 规则（对齐原工程 + 用户确认）：`title\ndescription`，**单换行、三端一致、不含 url**；空字段跳过。
+ */
+export function buildShareText(title: string, description: string): string {
+  const parts: string[] = [];
+  if (title !== '') {
+    parts.push(title);
+  }
+  if (description !== '') {
+    parts.push(description);
+  }
+  return parts.join('\n');
+}