In order to solve the problems in multi-user terminal access and tests of wireless Access Controller（AC） performances when dealing with large numbers of users in its development and tests

this paper mainly introduces the design principle of a STA simulator that supports Extensible Authentication Protocol-Subscriber Identity Module（EAP-SIM） authentication

In line with EAP-SIM protocol

this simulator simulates the access and authentication flow of real SIM card users

implements the access and authentication of large numbers of users

and performs pressure and performance tests on the AC.