diff --git a/src/gui/panels/step8_panel.py b/src/gui/panels/step8_panel.py
index 8339ef7..b3f845a 100644
--- a/src/gui/panels/step8_panel.py
+++ b/src/gui/panels/step8_panel.py
@@ -42,10 +42,11 @@ class Step8Panel(QWidget):
 
     def __init__(self, parent=None):
         super().__init__(parent)
-        self.index_checkboxes: Dict[str, QCheckBox] = {}
+        self.index_checkboxes: Dict[str, QListWidgetItem] = {}
         self.work_dir: Optional[str] = None
         self.builtin_formula_path = get_resource_path("waterindex.csv")
         self._formula_type_map: Dict[str, str] = {}
+        self._formula_color_map: Dict[str, QColor] = {}
 
         self.init_ui()
         self._auto_load_formulas()
@@ -156,11 +157,12 @@ class Step8Panel(QWidget):
 
     def _on_item_changed(self, item: QListWidgetItem):
         if item.checkState() == Qt.Checked:
-            color_data = item.data(Qt.UserRole + 1)
-            if isinstance(color_data, QColor):
-                item.setBackground(QBrush(QColor(color_data)))
-            else:
-                item.setBackground(QBrush(self.COLOR_RATIO))
+            bg_color = self.COLOR_RATIO
+            for name, ref_item in self.index_checkboxes.items():
+                if ref_item is item:
+                    bg_color = self._formula_color_map.get(name, self.COLOR_RATIO)
+                    break
+            item.setBackground(QBrush(bg_color))
         else:
             item.setBackground(QBrush(self.COLOR_RATIO))
 
@@ -203,17 +205,16 @@ class Step8Panel(QWidget):
             self.formula_list.clear()
             self.index_checkboxes.clear()
 
+            self._formula_color_map.clear()
             for name, ftype in self._formula_type_map.items():
                 item = QListWidgetItem(name, self.formula_list)
                 item.setCheckState(Qt.Checked)
                 if ftype == 'concentration':
                     bg_color = QColor(220, 240, 255)
-                    item.setData(Qt.UserRole + 1, bg_color)
-                    item.setBackground(QBrush(bg_color))
                 else:
                     bg_color = self.COLOR_RATIO
-                    item.setData(Qt.UserRole + 1, bg_color)
-                    item.setBackground(QBrush(bg_color))
+                self._formula_color_map[name] = bg_color
+                item.setBackground(QBrush(bg_color))
                 self.index_checkboxes[name] = item
 
             self.formula_list.adjustSize()
diff --git a/src/gui/panels/step9_panel.py b/src/gui/panels/step9_panel.py
index 34b7f0b..9575c17 100644
--- a/src/gui/panels/step9_panel.py
+++ b/src/gui/panels/step9_panel.py
@@ -297,23 +297,20 @@ class Step9Panel(QWidget):
             else:
                 self.work_dir = None
 
-            # 1. 尝试从 Step5 界面读取训练光谱 CSV 路径
+            # 1. 尝试从 Step8 界面读取训练光谱 CSV 路径
             main_window = self.window()
-            if main_window and hasattr(main_window, 'step5_panel'):
-                step5_widget = getattr(main_window.step5_panel, 'output_file', None)
-                step5_output_path = ""
-                if hasattr(step5_widget, 'get_path'):
-                    step5_output_path = step5_widget.get_path() or ""
-                elif hasattr(step5_widget, 'text'):
-                    step5_output_path = step5_widget.text() or ""
+            if main_window and hasattr(main_window, 'step8_panel'):
+                step8_widget = main_window.step8_panel.training_data_widget
+                step8_output_path = ""
+                if hasattr(step8_widget, 'get_path'):
+                    step8_output_path = step8_widget.get_path() or ""
 
-                if step5_output_path:
-                    # 若为相对路径，使用 work_dir 合成为绝对路径
-                    if not os.path.isabs(step5_output_path):
-                        step5_output_path = os.path.join(self.work_dir or '', step5_output_path).replace('\\', '/')
+                if step8_output_path:
+                    if not os.path.isabs(step8_output_path):
+                        step8_output_path = os.path.join(self.work_dir or '', step8_output_path).replace('\\', '/')
                     existing = self.csv_file.get_path()
                     if not existing or not existing.strip():
-                        self.csv_file.set_path(step5_output_path)
+                        self.csv_file.set_path(step8_output_path)
 
             # 1.5 自动探测并回填 Step 8 双轨输出的 Traditional_Indices 目录
             if self.work_dir: