diff --git a/app/services/subjects/data_statistic_service.rb b/app/services/subjects/data_statistic_service.rb
index 9311953ca..29696cf15 100644
--- a/app/services/subjects/data_statistic_service.rb
+++ b/app/services/subjects/data_statistic_service.rb
@@ -3,7 +3,7 @@ class Subjects::DataStatisticService < ApplicationService
   def initialize(subject, user)
     @subject = subject
     @user = user
-    @shixuns = subject.shixuns
+    @shixun_ids = subject.shixuns.pluck(:id)
   end
 
   # 学习总人数
@@ -14,9 +14,11 @@ class Subjects::DataStatisticService < ApplicationService
   # 课堂学习人数
   def course_study_count
     # 实训作业
-    sw_user_ids = StudentWork.where.not(myshixun_id: nil).pluck(:user_id)
+    sw_user_ids = StudentWork.where.not(myshixun_id: nil).joins(homework_common: :homework_commons_shixuns)
+                      .where(homework_commons_shixuns: {shixun_id: @shixun_ids}).pluck("student_works.user_id")
     # 试卷的实训题
-    esa_user_ids = ExerciseShixunAnswer.where()
+    esa_user_ids = ExerciseShixunAnswer.joins(exercise_shixun_challenge: :shixun)
+                       .where(shixuns: {id: @shixun_ids}).pluck("exercise_shixun_answers.user_id")
   end
 
 end