diff --git a/apps/desktop/src-tauri/src/infrastructure/markdown_parser.rs b/apps/desktop/src-tauri/src/infrastructure/markdown_parser.rs
index 0a19205..7079767 100644
--- a/apps/desktop/src-tauri/src/infrastructure/markdown_parser.rs
+++ b/apps/desktop/src-tauri/src/infrastructure/markdown_parser.rs
@@ -63,6 +63,8 @@ pub struct Position {
     pub column: usize,
     /// 字符偏移量（从0开始）
     pub offset: usize,
+    /// 字节偏移量（从0开始）
+    pub byte_offset: usize,
 }
 
 /// 范围信息
@@ -154,13 +156,14 @@ impl MarkdownParser {
         })
     }
 
-    /// 计算文本中的位置信息
-    fn calculate_position(&self, text: &str, offset: usize) -> Position {
+    /// 根据字节偏移计算位置信息
+    fn calculate_position_from_byte_offset(&self, text: &str, byte_offset: usize) -> Position {
         let mut line = 0;
         let mut column = 0;
+        let mut char_offset = 0;
 
-        for (i, ch) in text.char_indices() {
-            if i >= offset {
+        for (byte_idx, ch) in text.char_indices() {
+            if byte_idx >= byte_offset {
                 break;
             }
             if ch == '\n' {
@@ -169,15 +172,52 @@ impl MarkdownParser {
             } else {
                 column += 1;
             }
+            char_offset += 1;
         }
 
         Position {
             line,
             column,
-            offset,
+            offset: char_offset,
+            byte_offset,
         }
     }
 
+    /// 根据字符偏移计算位置信息
+    fn calculate_position_from_char_offset(&self, text: &str, char_offset: usize) -> Position {
+        let mut line = 0;
+        let mut column = 0;
+        let mut current_char_offset = 0;
+        let mut byte_offset = 0;
+
+        for (byte_idx, ch) in text.char_indices() {
+            if current_char_offset >= char_offset {
+                break;
+            }
+            if ch == '\n' {
+                line += 1;
+                column = 0;
+            } else {
+                column += 1;
+            }
+            current_char_offset += 1;
+            byte_offset = byte_idx + ch.len_utf8();
+        }
+
+        Position {
+            line,
+            column,
+            offset: char_offset,
+            byte_offset,
+        }
+    }
+
+    /// 计算文本中的位置信息（保持向后兼容）
+    fn calculate_position(&self, text: &str, offset: usize) -> Position {
+        // 为了向后兼容，假设传入的是字节偏移
+        self.calculate_position_from_byte_offset(text, offset)
+    }
+
     /// 解析Markdown文本
     pub fn parse(&mut self, text: &str) -> Result<MarkdownParseResult> {
         let start_time = std::time::Instant::now();
@@ -222,8 +262,8 @@ impl MarkdownParser {
             node_type: MarkdownNodeType::Document,
             content: source_text.to_string(),
             range: Range {
-                start: Position { line: 0, column: 0, offset: 0 },
-                end: self.calculate_position(source_text, source_text.len()),
+                start: self.calculate_position_from_byte_offset(source_text, 0),
+                end: self.calculate_position_from_byte_offset(source_text, source_text.len()),
             },
             children: Vec::new(),
             attributes: HashMap::new(),
diff --git a/apps/desktop/src/components/EnhancedMarkdownRenderer.tsx b/apps/desktop/src/components/EnhancedMarkdownRenderer.tsx
index c922aa0..fccd8ab 100644
--- a/apps/desktop/src/components/EnhancedMarkdownRenderer.tsx
+++ b/apps/desktop/src/components/EnhancedMarkdownRenderer.tsx
@@ -99,13 +99,13 @@ export const EnhancedMarkdownRenderer: React.FC<EnhancedMarkdownRendererProps> =
       return null;
     }
 
-    // 计算节点在原始文本中的字符偏移位置 
-    const nodeStartOffset = node.range?.start?.offset || 0;
-    const nodeEndOffset = node.range?.end?.offset || 0;
+    // 计算节点在原始文本中的字节偏移位置（与grounding数据的字节偏移匹配）
+    const nodeStartOffset = node.range?.start?.byte_offset || 0;
+    const nodeEndOffset = node.range?.end?.byte_offset || 0;
+
     // 查找与当前节点位置重叠的grounding支持信息
-      
     const relatedSupports = groundingMetadata.grounding_supports.filter(support => {
-      // 这里是字符串二进制的offset
+      // grounding数据使用字节偏移
       const segmentStart = support.segment.startIndex;
       const segmentEnd = support.segment.endIndex;
 
@@ -113,7 +113,11 @@ export const EnhancedMarkdownRenderer: React.FC<EnhancedMarkdownRendererProps> =
       // 检查节点范围与grounding片段是否有重叠
       return hasOverlap;
     });
-
+    console.log({
+      relatedSupports,
+      nodeStartOffset,
+      nodeEndOffset
+    })
     if (relatedSupports.length > 0) {
       // 获取相关的来源信息
       const relatedSources = relatedSupports.flatMap(support =>
diff --git a/apps/desktop/src/types/markdown.ts b/apps/desktop/src/types/markdown.ts
index 00fd600..be97383 100644
--- a/apps/desktop/src/types/markdown.ts
+++ b/apps/desktop/src/types/markdown.ts
@@ -37,6 +37,8 @@ export interface Position {
   column: number;
   /** 字符偏移量（从0开始） */
   offset: number;
+  /** 字节偏移量（从0开始） */
+  byte_offset: number;
 }
 
 /**