diff --git a/test_server/examtest/views.py b/test_server/examtest/views.py
index efd305a..413d10f 100644
--- a/test_server/examtest/views.py
+++ b/test_server/examtest/views.py
@@ -87,8 +87,8 @@ class WorkScopeViewSet(ModelViewSet):
         questioncats = workscope.questioncat.exclude(name='辐射小知识更新中').order_by('type')
         if questioncats.count() == 3:
             import random
-            b2 = random.randint(1,9)
-            b3 = random.randint(1,b2+1)
+            b2 = random.randint(1,8)
+            b3 = random.randint(1,9-b2)
             b1 = 10 - b2 -b3
             a1 = 2*b2 + 2*b3 - 2
             a2 = 18 - 2*b2