diff --git a/PWFile.py b/PWFile.py
index 9798e3d..691b542 100644
--- a/PWFile.py
+++ b/PWFile.py
@@ -220,7 +220,11 @@ class StringImpactPlate:
         tower_key_list = list(tower_dict.keys())
         try:
             index_of_first_tower = tower_key_list.index(start_tower_name)
-            index.append(index_of_first_tower)
+            if (
+                tower_dict[tower_key_list[index_of_first_tower]].is_tension_tower
+                == True
+            ):
+                index.append(index_of_first_tower)
         except ValueError:  # 没找到第一个塔，就直接返回
             return index
         try:
@@ -234,7 +238,8 @@ class StringImpactPlate:
                     == True
                 ):
                     index.append(index_of_tension_tower)
-            index.append(index_of_last_tower)
+            if tower_dict[tower_key_list[index_of_last_tower]].is_tension_tower == True:
+                index.append(index_of_last_tower)
         except ValueError:  # 没找到最后一个塔，就只画一个耐张段
             for index_of_tension_tower in range(
                 index_of_first_tower + 1, len(tower_key_list)
@@ -296,7 +301,9 @@ class StringImpactPlate:
         for draw_tower_index in draw_tower_indexes:
             draw_tower_key = tower_key_list[draw_tower_index]
             tower_info: SEntry = tower_dict[draw_tower_key]
-            if draw_tower_index != draw_tower_indexes[-1]:  # 不是最后一个
+            if draw_tower_index < tower_key_list.index(
+                self._draw_end_tower_name
+            ):  # 不是最后一个，或者只有第一个。
                 # 画前侧
                 forth_reprtv_span = tower_info.forth_representive_span
                 continouse_sheet.range("B69").value = forth_reprtv_span
@@ -330,7 +337,7 @@ class StringImpactPlate:
                     plate_origin[0]
                     + (
                         tower_dict[tower_key_list[draw_tower_index]].mileage_in_s
-                        - tower_dict[tower_key_list[draw_tower_indexes[0]]].mileage_in_s
+                        - tower_dict[self._draw_start_tower_name].mileage_in_s
                     )
                     / 5
                     + x / 5
@@ -339,7 +346,7 @@ class StringImpactPlate:
                     [
                         tower_dict[tower_key_list[bar]].altitude_off
                         for bar in range(
-                            draw_tower_indexes[0] + 1, draw_tower_index + 1
+                            tower_key_list.index(self._draw_start_tower_name) + 1, draw_tower_index + 1
                         )
                     ]
                 )
@@ -349,7 +356,9 @@ class StringImpactPlate:
                     + (tower_info.tower_height - tower_info.foundation_low + y) * 2
                 ).reshape(len(x), 1)
                 self._plot(cad, plot_x, plot_y)
-            if draw_tower_index != draw_tower_indexes[0]:  # 不是第一个
+            if draw_tower_index > tower_key_list.index(
+                self._draw_start_tower_name
+            ):  # 不是第一个，或者只有最后一个
                 # 画后侧
                 back_reprtv_span = tower_info.back_representive_span
                 continouse_sheet.range("B69").value = back_reprtv_span
@@ -383,7 +392,7 @@ class StringImpactPlate:
                     plate_origin[0]
                     + (
                         tower_dict[tower_key_list[draw_tower_index]].mileage_in_s
-                        - tower_dict[tower_key_list[draw_tower_indexes[0]]].mileage_in_s
+                        - tower_dict[self._draw_start_tower_name].mileage_in_s
                     )
                     / 5
                     - x / 5  # 从右往左画
@@ -392,7 +401,7 @@ class StringImpactPlate:
                     [
                         tower_dict[tower_key_list[bar]].altitude_off
                         for bar in range(
-                            draw_tower_indexes[0] + 1, draw_tower_index + 1
+                            tower_key_list.index(self._draw_start_tower_name) + 1, draw_tower_index + 1
                         )
                     ]
                 )