diff --git a/app/analysis.py b/app/analysis.py
index 018cc85..58d6121 100644
--- a/app/analysis.py
+++ b/app/analysis.py
@@ -4,8 +4,10 @@ import pandas as pd
 import matplotlib
 matplotlib.use('Agg')  # headless backend
 import matplotlib.pyplot as plt
+from matplotlib import font_manager
 from scipy.optimize import curve_fit
 from scipy.signal import savgol_filter as _savgol_filter
+import os
 
 logger = logging.getLogger(__name__)
 
@@ -158,6 +160,20 @@ def calculate_large_angle_g(L, periods, gamma):
     return None
 
 
+# 设置中文字体
+font_path = './fonts/PingFangSC-Medium.ttf'
+if os.path.exists(font_path):
+    prop = font_manager.FontProperties(fname=font_path)
+    plt.rcParams['font.family'] = prop.get_name()
+    plt.rcParams['axes.unicode_minus'] = False
+    logger.info(f"成功加载字体文件: {font_path}")
+else:
+    # 备选方案
+    plt.rcParams['font.sans-serif'] = ['PingFang SC', 'SimHei', 'DejaVu Sans']
+    plt.rcParams['axes.unicode_minus'] = False
+    logger.warning(f"字体文件不存在: {font_path}, 使用系统字体")
+
+
 def calculate_physical_parameters(L, popt):
     """
     从拟合参数计算物理参数
@@ -171,9 +187,6 @@ def calculate_physical_parameters(L, popt):
     return g, b_over_m, g_no_damping
 
 
-plt.rcParams['font.sans-serif'] = ['PingFang HK']
-
-
 def visualize_results(t, theta, theta_smooth, theta_fit, fitted_params, data=None, pivot=None, mm_per_pixel=None, output_path='pendulum_fit_analysis.png'):
     """可视化实验数据和拟合结果"""
     fig = plt.figure(figsize=(12, 18))
diff --git a/app/fonts/PingFangSC-Medium.ttf b/app/fonts/PingFangSC-Medium.ttf
new file mode 100644
index 0000000..00b9dcc
Binary files /dev/null and b/app/fonts/PingFangSC-Medium.ttf differ