diff --git a/app/controllers/oauth/acge_controller.rb b/app/controllers/oauth/acge_controller.rb
index d9db8a895..73360cf6c 100644
--- a/app/controllers/oauth/acge_controller.rb
+++ b/app/controllers/oauth/acge_controller.rb
@@ -33,8 +33,11 @@ class Oauth::AcgeController < Oauth::BaseController
             username = uid[0..7]
             password = SecureRandom.hex(4)
             reg_result = autologin_register(username, email, password, 'acge', phone, name)
-            CSV.open("public/操作系统大赛用户信息.csv", 'wb') do |csv| 
-              csv << [username, email, password, phone, name]
+            existing_rows = CSV.read("public/操作系统大赛用户信息.csv")
+            new_row = [username, email, password, phone, name]
+            existing_rows << new_row
+            CSV.open("public/操作系统大赛用户信息.csv", 'w') do |csv| 
+              existing_rows.each { |row| csv << row }
             end
             if reg_result[:message].blank?
               open_user = OpenUsers::Acge.create!(user_id: reg_result[:user][:id], uid: uid)