diff --git a/src/db_manager.py b/src/db_manager.py
index d8adc01..7844ff6 100644
--- a/src/db_manager.py
+++ b/src/db_manager.py
@@ -105,7 +105,7 @@ class DatabaseManager:
             return False, f"认证失败: {str(e)}"
 
     @log_timing
-    def get_latest_sample_data(self):
+    def get_latest_sample_data(self, data_source=None):
         """
         Retrieves the most recently measured sample data, flattened.
         Returns a dictionary where keys are element names and values are concentrations.
@@ -121,12 +121,10 @@ class DatabaseManager:
             query = f"""
                 SELECT *
                 FROM {self.schema}.element_analysis_data
-                WHERE measure_datetime = (
-                    SELECT MAX(measure_datetime) FROM {self.schema}.element_analysis_data
-                )
+                WHERE data_source = %s
             """
             
-            cur.execute(query)
+            cur.execute(query, (data_source,))
             rows = cur.fetchall()
             cur.close()
             conn.close()
diff --git a/ui/base_page.py b/ui/base_page.py
index 6c6cf66..9c03d64 100644
--- a/ui/base_page.py
+++ b/ui/base_page.py
@@ -226,8 +226,9 @@ class BaseInspectionPage(QDialog):
             self.show_info("数据库错误", f"插入失败: {db_msg}\n(请检查数据库连接)")
             return
 
+        data_source = parsed_data[0].get('data_source') if parsed_data else None
         with log_timing_context("DB读取最新样本数据", "base_page"):
-            latest_data = db.get_latest_sample_data()
+            latest_data = db.get_latest_sample_data(data_source)
         if latest_data:
             self.update_ui_with_data(latest_data)
             self.show_info("同步成功", f"已同步 {len(parsed_data)} 条元素数据。\n源文件: {target_xml_name}")