Zhangjiagang Su 'an code training address is 20 meters east of the intersection of North Second Ring Road and Guotai North Road in Zhangjiagang City; Su 'an Code is a safety supervision code for employees in Suzhou construction field, which is widely used in Suzhou construction field during work. It is an important certificate for the majority of construction employees to engage in construction work, and at the same time, it is the main basis for checking the real-name registration system of construction employees, which is of great significance to improve the safety management level of construction employees.