diff --git a/core.py b/core.py
index 0a63ee8..a012a85 100644
--- a/core.py
+++ b/core.py
@@ -28,9 +28,6 @@ class Parameter:
     ac_or_dc: str  # 交流或直流标识，"AC" 或 "DC"，默认 "AC"
 
 
-para = Parameter()
-
-
 def rg_line_function_factory(_rg, ground_angel):  # 返回一个地面捕雷线的直线方程
     y_d = _rg / math.cos(ground_angel)  # y轴上的截距
     # 利用公式y-y0=k(x-x0) 得到直线公式
@@ -188,9 +185,8 @@ def solve_circle_line_intersection(
         return [_x, _y]
 
 
-def min_i(string_len, u_ph):
+def min_i(string_len, u_ph, altitude: float = 0):
     # 海拔修正
-    altitude = para.altitude
     if altitude > 1000:
         k_a = math.exp((altitude - 1000) / 8150)  # 气隙海拔修正
     else:
@@ -456,9 +452,9 @@ def tangent_line_k(line_x, line_y, center_x, center_y, radius, init_k=10.0):
     return np.array(k_candidate)[np.max(k_angle) == k_angle].tolist()[-1]
 
 
-def func_ng(td):  # 地闪密度，通过雷暴日计算
-    if para.ng > 0:
-        r = para.ng
+def func_ng(td, ng: float = 0):  # 地闪密度，通过雷暴日计算
+    if ng > 0:
+        r = ng
     else:
         r = 0.023 * (td**1.3)
     return r
diff --git a/main-batch.py b/main-batch.py
index 00b3c28..fd120b0 100644
--- a/main-batch.py
+++ b/main-batch.py
@@ -30,7 +30,8 @@ def parameter_display(para_dis: Parameter):
         logger.info(f"雷暴日 d {para_dis.td}")
 
 
-def read_parameter(toml_file_path):
+def read_parameter(toml_file_path) -> Parameter:
+    para = Parameter()
     with open(toml_file_path, "rb") as toml_fs:
         toml_dict = tomli.load(toml_fs)
         toml_parameter = toml_dict["parameter"]
@@ -55,6 +56,7 @@ def read_parameter(toml_file_path):
         toml_optional = toml_dict["optional"]
         para.voltage_n = toml_optional["voltage_n"]  # 工作电压分成多少份来计算
         para.max_i = toml_optional["max_i"]
+    return para
 
 
 def egm():
@@ -66,7 +68,7 @@ def egm():
         logger.info(f"无法找到数据文件{toml_file_path}，程序退出。")
         sys.exit(0)
     logger.info(f"读取文件{toml_file_path}")
-    read_parameter(toml_file_path)
+    para = read_parameter(toml_file_path)
     #########################################################
     # 以上是需要设置的参数
     parameter_display(para)
@@ -93,7 +95,7 @@ def egm():
                 phase_n = 1
             # 地闪密度 利用Q╱GDW 11452-2015 架空输电线路防雷导则的公式 Ng=0.023*Td^(1.3) 20天雷暴日地闪密度为1.13
             td = para.td
-            ng = func_ng(td)
+            ng = func_ng(td, para.ng)
             avr_n_sf = 0  # 考虑电压的影响计算的跳闸率
             ground_angels = para.ground_angels
             for ground_angel in ground_angels:
@@ -150,7 +152,7 @@ def egm():
                         i_max = 0
                         insulator_c_len = para.insulator_c_len
                         # i_min = min_i(insulator_c_len, u_ph / 1.732)
-                        i_min = min_i(insulator_c_len, u_ph)
+                        i_min = min_i(insulator_c_len, u_ph, para.altitude)
                         _min_i = i_min  # 尝试的最小电流
                         _max_i = para.max_i  # 尝试的最大电流
                         # cad.draw(i_min, u_ph, rs_x, rs_y, rc_x, rc_y, rg_x, rg_y, rg_type, 2)
diff --git a/main.py b/main.py
index 003c2ca..b675d22 100644
--- a/main.py
+++ b/main.py
@@ -32,7 +32,8 @@ def parameter_display(para_dis: Parameter):
         logger.info(f"雷暴日 d {para_dis.td}")
 
 
-def read_parameter(toml_file_path):
+def read_parameter(toml_file_path) -> Parameter:
+    para = Parameter()
     with open(toml_file_path, "rb") as toml_fs:
         toml_dict = tomli.load(toml_fs)
         toml_parameter = toml_dict["parameter"]
@@ -58,6 +59,7 @@ def read_parameter(toml_file_path):
         toml_optional = toml_dict["optional"]
         para.voltage_n = toml_optional["voltage_n"]  # 工作电压分成多少份来计算
         para.max_i = toml_optional["max_i"]
+    return para
 
 
 def run_egm(para: Parameter) -> dict:
@@ -88,7 +90,7 @@ def run_egm(para: Parameter) -> dict:
         phase_n = 1
     # 地闪密度 利用Q╱GDW 11452-2015 架空输电线路防雷导则的公式 Ng=0.023*Td^(1.3) 20天雷暴日地闪密度为1.13
     td = para.td
-    ng = func_ng(td)
+    ng = func_ng(td, para.ng)
     avr_n_sf = 0  # 考虑电压的影响计算的跳闸率
     ground_angels = para.ground_angels
     # 初始化动画
@@ -152,7 +154,7 @@ def run_egm(para: Parameter) -> dict:
                 insulator_c_len = para.insulator_c_len
                 # i_min = min_i(insulator_c_len, u_ph / 1.732)
                 # TODO 需要考虑交、直流
-                i_min = min_i(insulator_c_len, u_ph)
+                i_min = min_i(insulator_c_len, u_ph, para.altitude)
                 _min_i = i_min  # 尝试的最小电流
                 _max_i = para.max_i  # 尝试的最大电流
                 # cad.draw(i_min, u_ph, rs_x, rs_y, rc_x, rc_y, rg_x, rg_y, rg_type, 2)
@@ -380,7 +382,7 @@ def egm():
         logger.info(f"无法找到数据文件{toml_file_path}，程序退出。")
         sys.exit(0)
     logger.info(f"读取文件{toml_file_path}")
-    read_parameter(toml_file_path)
+    para = read_parameter(toml_file_path)
     run_egm(para)
 
 
diff --git a/webview_app.py b/webview_app.py
index 58c8a44..59cac77 100644
--- a/webview_app.py
+++ b/webview_app.py
@@ -18,7 +18,7 @@ from loguru import logger
 project_root = Path(__file__).parent
 sys.path.insert(0, str(project_root))
 
-from core import para
+from core import Parameter
 from main import parameter_display, run_egm
 
 
@@ -148,7 +148,8 @@ class EGMWebApp:
             advance_data = params.get('advance', {})
             optional_data = params.get('optional', {})
 
-            # 更新全局参数对象
+            # 创建局部参数对象
+            para = Parameter()
             para.h_g_sag = float(parameter_data.get('h_g_sag', 11.67))
             para.h_c_sag = float(parameter_data.get('h_c_sag', 14.43))
             para.td = int(parameter_data.get('td', 20))