Aiming at the current status of Body Control Module (BCM) function test, the integrated Carbody control module BCM online automatic testing system with using the control mode of personal computer (PC) + porgrammable logic controller (PLC) was presented. The production line and the needle bar mechanism to run automatically were mainly completed by PLC, and the manmachine interaction (MMI) function was implemented through the MCGS configuration interface of touchscreen. Through level switch using the external interface circuit the effective function test and the invalid function test of BCM were realized through computer programming in the PC with a PCI1753E card installed. The system can replace manual operation, and has the advantages of high testing speed, high efficiency, and etc.