diff --git a/apps/web/src/App.tsx b/apps/web/src/App.tsx
index 1433777..e0c18bf 100644
--- a/apps/web/src/App.tsx
+++ b/apps/web/src/App.tsx
@@ -258,7 +258,7 @@ export default function App() {
       "/health/follow-up-records", "/health/consultations",
       "/health/points-rules", "/health/points-products", "/health/points-orders",
       "/health/offline-events", "/health/ai-prompts", "/health/ai-analysis",
-      "/health/ai-usage", "/health/ai-config", "/health/ai-knowledge", "/health/alerts", "/health/alert-dashboard",
+      "/health/ai-usage", "/health/ai-config", "/health/ai-knowledge", "/health/ai-knowledge-v2", "/health/alerts", "/health/alert-dashboard",
       "/ai/chat",
       "/health/alert-rules", "/health/devices", "/health/realtime-monitor",
       "/health/oauth-clients", "/health/dialysis", "/health/action-inbox",
diff --git a/apps/web/src/routeConfig.ts b/apps/web/src/routeConfig.ts
index 7dab879..636cda4 100644
--- a/apps/web/src/routeConfig.ts
+++ b/apps/web/src/routeConfig.ts
@@ -151,6 +151,10 @@ const ENTRIES: RoutePermissionEntry[] = [
     path: "/health/ai-knowledge",
     permissions: ["ai.knowledge.list", "ai.knowledge.manage"],
   },
+  {
+    path: "/health/ai-knowledge-v2",
+    permissions: ["ai.knowledge.list", "ai.knowledge.manage"],
+  },
 
   // ===== 健康管理 — 积分商城 =====
   {
diff --git a/crates/erp-ai/src/service/document/chunker.rs b/crates/erp-ai/src/service/document/chunker.rs
new file mode 100644
index 0000000..8666128
--- /dev/null
+++ b/crates/erp-ai/src/service/document/chunker.rs
@@ -0,0 +1,87 @@
+/// 文本切片：按固定大小 + 重叠切分
+pub fn chunk_text(text: &str, chunk_size: usize, overlap: usize) -> Vec<String> {
+    if text.is_empty() {
+        return vec![];
+    }
+
+    let chars: Vec<char> = text.chars().collect();
+    let total = chars.len();
+
+    if total <= chunk_size {
+        return vec![text.to_string()];
+    }
+
+    let mut chunks = Vec::new();
+    let mut start = 0;
+
+    while start < total {
+        let end = (start + chunk_size).min(total);
+        let chunk: String = chars[start..end].iter().collect();
+
+        let trimmed = chunk.trim().to_string();
+        if !trimmed.is_empty() {
+            chunks.push(trimmed);
+        }
+
+        if end >= total {
+            break;
+        }
+        start += chunk_size.saturating_sub(overlap);
+
+        // 防止无限循环
+        if start <= end - chunk_size && start > 0 {
+            start = end;
+        }
+    }
+
+    chunks
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_chunk_empty() {
+        assert_eq!(chunk_text("", 100, 20), Vec::<String>::new());
+    }
+
+    #[test]
+    fn test_chunk_small_text() {
+        let text = "hello world";
+        let chunks = chunk_text(text, 100, 20);
+        assert_eq!(chunks.len(), 1);
+        assert_eq!(chunks[0], "hello world");
+    }
+
+    #[test]
+    fn test_chunk_long_text() {
+        let text = "abcdefghij".repeat(100); // 1000 chars
+        let chunks = chunk_text(&text, 200, 50);
+        assert!(chunks.len() > 1);
+        // First chunk should be 200 chars
+        assert_eq!(chars_count(&chunks[0]), 200);
+    }
+
+    #[test]
+    fn test_chunk_with_overlap() {
+        let text = "abcdefghijklmnopqrstuvwxyz".repeat(20); // 520 chars
+        let chunks = chunk_text(&text, 100, 20);
+        assert!(chunks.len() > 1);
+    }
+
+    #[test]
+    fn test_chunk_chinese() {
+        let text = "你好世界这是一段中文测试文本。".repeat(30);
+        let chunks = chunk_text(&text, 100, 20);
+        assert!(chunks.len() > 1);
+        // 确保中文不被截断
+        for chunk in &chunks {
+            assert!(!chunk.is_empty());
+        }
+    }
+
+    fn chars_count(s: &str) -> usize {
+        s.chars().count()
+    }
+}
diff --git a/crates/erp-ai/src/service/mod.rs b/crates/erp-ai/src/service/mod.rs
index c192f76..bd02050 100644
--- a/crates/erp-ai/src/service/mod.rs
+++ b/crates/erp-ai/src/service/mod.rs
@@ -7,6 +7,7 @@ pub mod chat_session;
 pub mod comparison;
 pub mod cost;
 pub mod dialysis_risk_scorer;
+pub mod document;
 pub mod embedding;
 pub mod feature_flag_service;
 pub mod insight_service;
diff --git a/crates/erp-server/migration/src/lib.rs b/crates/erp-server/migration/src/lib.rs
index 57ae836..385ab71 100644
--- a/crates/erp-server/migration/src/lib.rs
+++ b/crates/erp-server/migration/src/lib.rs
@@ -174,6 +174,7 @@ mod m20260526_000164_ai_prompt_add_analysis_type;
 mod m20260526_000165_ai_prompt_fix_analysis_type;
 mod m20260526_000166_create_ai_knowledge_bases;
 mod m20260526_000167_create_ai_knowledge_documents;
+mod m20260527_000168_ai_knowledge_v2_menu;
 
 pub struct Migrator;
 
@@ -355,6 +356,7 @@ impl MigratorTrait for Migrator {
             Box::new(m20260526_000165_ai_prompt_fix_analysis_type::Migration),
             Box::new(m20260526_000166_create_ai_knowledge_bases::Migration),
             Box::new(m20260526_000167_create_ai_knowledge_documents::Migration),
+            Box::new(m20260527_000168_ai_knowledge_v2_menu::Migration),
         ]
     }
 }
diff --git a/crates/erp-server/migration/src/m20260527_000168_ai_knowledge_v2_menu.rs b/crates/erp-server/migration/src/m20260527_000168_ai_knowledge_v2_menu.rs
new file mode 100644
index 0000000..779f3ca
--- /dev/null
+++ b/crates/erp-server/migration/src/m20260527_000168_ai_knowledge_v2_menu.rs
@@ -0,0 +1,62 @@
+use sea_orm_migration::prelude::*;
+
+#[derive(DeriveMigrationName)]
+pub struct Migration;
+
+#[async_trait::async_trait]
+impl MigrationTrait for Migration {
+    async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        // 在"AI 知识库"同级位置添加"知识库 V2"菜单
+        // parent_id 取旧 ai-knowledge 菜单的 parent_id
+        let sql = r#"
+            INSERT INTO sys_menu (id, parent_id, name, path, icon, sort, permission, component, is_external, is_cached, status, visible, created_at, updated_at, deleted_at)
+            SELECT
+                gen_random_uuid(),
+                parent_id,
+                '知识库 V2',
+                '/health/ai-knowledge-v2',
+                'DatabaseOutlined',
+                54,
+                'ai.knowledge.list',
+                'ai/KnowledgeV2Page',
+                false,
+                false,
+                'active',
+                true,
+                now(),
+                now(),
+                NULL
+            FROM sys_menu
+            WHERE path = '/health/ai-knowledge' AND deleted_at IS NULL
+            LIMIT 1
+            ON CONFLICT DO NOTHING
+        "#;
+
+        manager.get_connection().execute_unprepared(sql).await?;
+
+        // 绑定到 admin 角色
+        let role_sql = r#"
+            INSERT INTO sys_role_menu (role_id, menu_id)
+            SELECT r.id, m.id
+            FROM sys_role r, sys_menu m
+            WHERE r.code = 'admin' AND r.deleted_at IS NULL
+              AND m.path = '/health/ai-knowledge-v2' AND m.deleted_at IS NULL
+            ON CONFLICT DO NOTHING
+        "#;
+
+        manager
+            .get_connection()
+            .execute_unprepared(role_sql)
+            .await?;
+
+        Ok(())
+    }
+
+    async fn down(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        manager
+            .get_connection()
+            .execute_unprepared("DELETE FROM sys_menu WHERE path = '/health/ai-knowledge-v2'")
+            .await?;
+        Ok(())
+    }
+}