diff --git a/src/gui/panels/step13_report_panel.py b/src/gui/panels/step13_report_panel.py
index 47b5e6c..d7b7a47 100644
--- a/src/gui/panels/step13_report_panel.py
+++ b/src/gui/panels/step13_report_panel.py
@@ -14,7 +14,7 @@ from src.gui.panels._step_path_resolver import resolve_subdir
 from PyQt5.QtCore import Qt, QThread, pyqtSignal, QSettings
 from PyQt5.QtWidgets import (
     QWidget, QVBoxLayout, QHBoxLayout, QGroupBox, QFormLayout,
-    QLabel, QCheckBox, QPushButton, QLineEdit, QComboBox, QSpinBox,
+    QLabel, QCheckBox, QPushButton, QLineEdit, QSpinBox,
     QMessageBox, QFileDialog, QProgressBar,
 )
 
@@ -34,13 +34,12 @@ class ReportWorkerThread(QThread):
     error = pyqtSignal(str)
 
     def __init__(self, work_dir: str, output_dir: Optional[str], report_title: str,
-                 enable_ai: bool, report_mode: str = 'ml', ai_maps_limit: int = 999):
+                 enable_ai: bool, ai_maps_limit: int = 999):
         super().__init__()
         self.work_dir = work_dir
         self.output_dir = output_dir
         self.report_title = report_title
         self.enable_ai = enable_ai
-        self.report_mode = report_mode
         self.ai_maps_limit = ai_maps_limit
 
     def run(self):
@@ -79,7 +78,7 @@ class ReportWorkerThread(QThread):
             out_path = gen.generate_report(
                 work_dir=self.work_dir,
                 report_title=self.report_title or "水质参数反演分析报告",
-                report_mode=self.report_mode,
+                report_mode='auto',
                 ai_maps_limit=self.ai_maps_limit,
                 on_progress=lambda pct, text: self.progress.emit(int(pct), str(text)),
             )
@@ -262,22 +261,7 @@ class Step13ReportPanel(QWidget):
         """)
         execute_layout.addWidget(self.progress_bar)
 
-        # 报告模式选择
-        mode_row = QHBoxLayout()
-        mode_row.setContentsMargins(0, 4, 0, 0)
-        mode_row.setSpacing(10)
-        mode_label = QLabel("报告模式:")
-        mode_label.setMinimumWidth(120)
-        mode_label.setMaximumWidth(120)
-        mode_row.addWidget(mode_label)
-        self.report_mode_cb = QComboBox()
-        self.report_mode_cb.addItem("机器学习水质参数反演", "ml")
-        self.report_mode_cb.addItem("水色指数与物理经验公式反演", "formula")
-        self.report_mode_cb.setStyleSheet(common_lineedit_css)
-        mode_row.addWidget(self.report_mode_cb, 1)
-        execute_layout.addLayout(mode_row)
-
-        # AI 专题图分析数量（仅公式模式生效）
+        # AI 专题图分析数量（仅水色指数公式模式生效，ML 模式忽略）
         ai_maps_row = QHBoxLayout()
         ai_maps_row.setContentsMargins(0, 0, 0, 0)
         ai_maps_row.setSpacing(10)
@@ -288,7 +272,7 @@ class Step13ReportPanel(QWidget):
         self.ai_maps_spin = QSpinBox()
         self.ai_maps_spin.setRange(0, 999)
         self.ai_maps_spin.setValue(999)
-        self.ai_maps_spin.setToolTip("公式报告中启用AI分析的分布图数量上限（0=全部跳过，999=全部分析）")
+        self.ai_maps_spin.setToolTip("公式报告中启用AI分析的分布图数量上限（0=跳过，999=全部分析）")
         self.ai_maps_spin.setStyleSheet(common_lineedit_css)
         ai_maps_row.addWidget(self.ai_maps_spin, 1)
         execute_layout.addLayout(ai_maps_row)
@@ -430,9 +414,8 @@ class Step13ReportPanel(QWidget):
         self.progress_bar.setValue(0)
         self.progress_label.setText("正在准备生成…")
 
-        report_mode = self.report_mode_cb.currentData()
         ai_maps_limit = self.ai_maps_spin.value()
-        self._report_thread = ReportWorkerThread(wd, out, title, enable_ai, report_mode, ai_maps_limit)
+        self._report_thread = ReportWorkerThread(wd, out, title, enable_ai, ai_maps_limit)
         self._report_thread.progress.connect(self._on_progress, Qt.QueuedConnection)
         self._report_thread.finished.connect(self._on_finished, Qt.QueuedConnection)
         self._report_thread.error.connect(self._on_error, Qt.QueuedConnection)
diff --git a/src/postprocessing/report_word.py b/src/postprocessing/report_word.py
index 86f72b6..57d29d7 100644
--- a/src/postprocessing/report_word.py
+++ b/src/postprocessing/report_word.py
@@ -778,15 +778,14 @@ class WaterQualityReportGenerator:
                        parameters: List[str] = None,
                        report_title: str = "水质参数反演分析报告",
                        output_path: Optional[str] = None,
-                       report_mode: str = 'ml',
+                       report_mode: str = 'auto',
                        ai_maps_limit: int = 999,
                        on_progress=None) -> str:
         """
-        生成 Word 报告（双轨制入口）
+        生成 Word 报告（双轨制入口，默认自动检测模式）
 
         Args:
-            report_mode: 'ml' → 机器学习报告, 'formula' → 水色指数/物理公式报告
-            on_progress: 可选回调 on_progress(percent: int, text: str)
+            report_mode: 'auto'→自动检测(参考Step11), 'ml'/'formula'→强制模式
         """
         # 设置工作目录
         if work_dir is not None:
@@ -805,8 +804,19 @@ class WaterQualityReportGenerator:
                          "spCond", "Turbidity", "TDS", "Cl-", "NO3-N",
                          "NH3-N", "BGA", "TT"]
 
+        # ── 自动检测管线模式（参考 Step11 逻辑）──
+        if report_mode == 'auto':
+            ml_dir = self.work_dir / "9_ML_Prediction"
+            formula_dir = self.work_dir / "10_WaterIndex_CSV"
+            if ml_dir.is_dir() and list(ml_dir.glob("*.csv")):
+                report_mode = 'ml'
+            elif formula_dir.is_dir() and list(formula_dir.glob("*.csv")):
+                report_mode = 'formula'
+            else:
+                report_mode = 'ml'  # 兜底
+
         self._pipeline_mode = 'water_index' if report_mode == 'formula' else 'ml'
-        print(f"[报告] 报告模式: {report_mode}")
+        print(f"[报告] 自动检测 → 模式: {report_mode}")
 
         if report_mode == 'formula':
             return self._generate_formula_report(parameters, report_title, output_path,