diff --git a/app/controllers/admin/olympiamanagements_controller.rb b/app/controllers/admin/olympiamanagements_controller.rb
index 2669edf..b998d56 100644
--- a/app/controllers/admin/olympiamanagements_controller.rb
+++ b/app/controllers/admin/olympiamanagements_controller.rb
@@ -22,7 +22,7 @@ class Admin::OlympiamanagementsController < OrbitAdminController
 			@students = OlympiaStudentDataField.where(:sign_up_setting_id=>@sign_up_setting.id)
 			@error_msg = []
 			if @students.length !=0
-				@students.destroy_all
+				@students.destroy
 				@error_msg << ((I18n.locale.to_s == "zh_tw") ? "已刪除#{@students.length}筆學生資料" : "Already delete #{@students.length} student data.")
 			else
 				@error_msg << ((I18n.locale.to_s == "zh_tw") ? "尚無學生資料" : "There is no student data yet.")
@@ -325,7 +325,7 @@ class Admin::OlympiamanagementsController < OrbitAdminController
 		@student_fields = OlympiaStudentDataField.where(:olympia_school_data_fields_id=>params[:olympia_school_id],:sign_up_setting_id=>@sign_up_setting_id).asc(:id).page(page_num).per(10)
 	end
 	def export_sign_up_student_data
-		@student_data_fields = OlympiaStudentDataField.all.asc(:id)
+		@student_data_fields = OlympiaStudentDataField.where(:sign_up_setting_id=>@sign_up_setting.id).asc(:id)
 		dir_path = 'tmp/olypiamanagement/'
 		#FileUtils.rm_r(dir_path, :force => true) if Dir.exist?(dir_path)
 		FileUtils.mkdir dir_path if !Dir.exist?(dir_path) #create dir for storing tmp_file if dir doesn't exist