成立級社係培正嘅傳統，每一個畢業班年級都喺小五年級成立級社，社名由穗、港、澳三地嘅培正學生投票決定，社旗由港澳學生以習作方式輪流設計。設立級社嘅目的係要薪火相傳，並聯繫畢業後嘅舊生，令大家聚首一堂。
The name of the club is voted by the Peizheng students in Guangzhou, Hong Kong and Macao, and the club flag is designed by Hong Kong and Macao students in turn. The purpose of the establishment of the class club is to pass on the torch and connect with the old students after graduation so that everyone can come together.