In order to improve the testing efficiency and reduce the design cost of the certain type transponder automated testing system, a new utomatic testing system based ondisplay control module OP7200 was present. The overall design method was introduced, and the hardware design was analyzed for power supply module, voltage-current detection module, OP7200 interface module, communication module, and so on. And analysis software design flow of OP7200 in environmental development Dynamic C. The results show that compare the new system with tradition testing system of manual control and abruption module, the new system saved the development cost about 40%, and improved the design efficiency about 35%. The application of the system indicates that it had good reliable performance and could be easily used so that the capability of transponder maintenance support was improved.