diff --git a/app/controllers/colleges_controller.rb b/app/controllers/colleges_controller.rb
index 2be7f3cd4..707255866 100644
--- a/app/controllers/colleges_controller.rb
+++ b/app/controllers/colleges_controller.rb
@@ -44,8 +44,8 @@ class CollegesController < ApplicationController
                                 (SELECT count(c.id) FROM courses c, course_members m WHERE c.id != 1309 and m.course_id = c.id AND m.user_id=users.id AND m.role in (1,2,3) and c.school_id = #{current_school.id} AND c.is_delete = 0) as course_count
                                 FROM `users`, user_extensions ue where ue.school_id=#{current_school.id} and users.id=ue.user_id and ue.identity=0 ORDER BY publish_shixun_count desc, course_count desc, id desc LIMIT 10")
     # ).order("publish_shixun_count desc, experience desc").limit(10)
-    @teacher_count = UserExtension.where(school_id: current_school.id)
-                       .select('SUM(IF(identity=0, 1, 0)) AS teachers_count').first.teachers_count
+    # @teacher_count = UserExtension.where(school_id: current_school.id)
+    #                    .select('SUM(IF(identity=0, 1, 0)) AS teachers_count').first.teachers_count
     @teachers =
       @teachers.map do |teacher|
         course_ids = Course.find_by_sql("SELECT c.id FROM courses c, course_members m WHERE c.id != 1309 and m.course_id = c.id AND m.role in (1,2,3) AND m.user_id=#{teacher.id} AND c.is_delete = 0 and c.school_id = #{current_school.id}")
@@ -99,7 +99,7 @@ class CollegesController < ApplicationController
 
     @course_count = courses.size
     courses = courses.left_joins(practice_homeworks: { student_works: { myshixun: :games } })
-                .select('courses.id, courses.name, courses.is_end, sum(games.evaluate_count) evaluating_count')
+                .select('courses.id, courses.name, courses.is_end, IFNULL(sum(games.evaluate_count), 0) evaluating_count')
                 .group('courses.id').order('is_end asc, evaluating_count desc')
 
     @courses = paginate courses
@@ -117,7 +117,7 @@ class CollegesController < ApplicationController
 
   # 学生实训
   def student_shixun
-    @student_count = User.joins(:user_extension).where(user_extensions: { school_id: current_school.id, identity: 1 }).count
+    # @student_count = User.joins(:user_extension).where(user_extensions: { school_id: current_school.id, identity: 1 }).count
     @students = User.joins(:user_extension).where(user_extensions: { school_id: current_school.id, identity: 1 }).includes(:user_extension).order('experience desc').limit(10)
 
     student_ids = @students.map(&:id)
diff --git a/app/views/colleges/student_shixun.json.jbuilder b/app/views/colleges/student_shixun.json.jbuilder
index 431603afa..97e418148 100644
--- a/app/views/colleges/student_shixun.json.jbuilder
+++ b/app/views/colleges/student_shixun.json.jbuilder
@@ -7,4 +7,4 @@ json.teachers @students do |student|
   json.grade student.grade
   json.experience student.experience
 end
-json.student_count @student_count
\ No newline at end of file
+# json.student_count @student_count
\ No newline at end of file
diff --git a/app/views/colleges/teachers.json.jbuilder b/app/views/colleges/teachers.json.jbuilder
index 29b383fa4..1308f0cf4 100644
--- a/app/views/colleges/teachers.json.jbuilder
+++ b/app/views/colleges/teachers.json.jbuilder
@@ -8,4 +8,4 @@ json.teachers @teachers do |teacher|
   json.complete_rate teacher['complete_rate']
   json.publish_shixun_count teacher['publish_shixun_count']
 end
-json.teacher_count @teacher_count
\ No newline at end of file
+# json.teacher_count @teacher_count
\ No newline at end of file