diff --git a/lib/tasks/static_all.rake b/lib/tasks/static_all.rake
index 6deec5da1..2290f0dc5 100644
--- a/lib/tasks/static_all.rake
+++ b/lib/tasks/static_all.rake
@@ -3,8 +3,9 @@ desc "统计每个学校使用数据"
 namespace :static_all do
   task :repo => :environment do
     school_alls = School.includes(:courses, user_extensions: :user).all
+    proc_num = ENV['processes'].blank? ? 5 : ENV['processes'].to_i
     school_alls.find_in_batches(batch_size: 50) do |schools|
-      Parallel.each(schools, in_processes: 5) do |school|
+      Parallel.each(schools, in_processes: proc_num) do |school|
         puts("school_id: #{school.id}")
         data = Schools::SchoolStatisticService.new(school)
         sta_all = StaAll.find_or_initialize_by(school_id: school.id)