diff --git a/app/views/admin/olympiamanagements/_student_export.xlsx.axlsx b/app/views/admin/olympiamanagements/_student_export.xlsx.axlsx
index 41141b7..0881ed5 100644
--- a/app/views/admin/olympiamanagements/_student_export.xlsx.axlsx
+++ b/app/views/admin/olympiamanagements/_student_export.xlsx.axlsx
@@ -10,6 +10,6 @@ wb.add_worksheet(name: "school_class") do |sheet|
   end
   sheet.add_row row , :style=> title,:widths => row.map{|cell| (cell.length* 11/ 2).round}
   @student_data_list.each do |infos_row|
-	 sheet.add_row infos_row , :style=> column
+	 sheet.add_row infos_row , :style=> column , :types => :string
   end
 end
\ No newline at end of file