The replacement maintenance mode of on-site protection brings new understanding to the existing protection maintenance mode and method. By analyzing the characteristics of the on-site protection device, the process of the replacement maintenance center and the maintenance demand, the replacement maintenance technical scheme of on-site protection is put forward. First, the characteristics of on-site protection technology and the condition of replacement maintenance are analyzed. Secondly, the requirement of a replacement maintenance test is analyzed from the aspects of protection logic, protection special network and component protection ring network. Finally, a special maintenance platform for a replacement maintenance center is proposed. Through this maintenance platform, all on-site protection detection problems are solved, and a one-button automatic testing mode is adopted to improve the efficiency of replacement maintenance. This provides an efficient solution for the on-site protection replacement maintenance mode. This work is supported by Science and Technology Project of State Grid Corporation of China (No. 2019YF-24) “Research on General Testing Technology for On-Site Protection Oriented to Replacement Maintenance”.