In order to overcome the existing disadvantages of complicated wiring, high failure rate, and weak anti-interference of relay interface of 25Hz track circuit, and make it electronic and intelligent, an electric control module for 25Hz track circuit is designed and implemented in adaption for electric computer interlocking system. The electric control module for 25Hz track circuit is designed as architecture of two out of two. In the hardware design, the module is divided into four functional units, including CPU unit, IO interface unit, power unit and reset unit. The software is designed following the EN50129 standard and consists of four functional parts: initialize unit, communicate control unit, driving unit and application unit. The reliability analysis of the electric control module for 25Hz track circuit is carried out based on FN2 model, and the results show that it can meet the safety requirements of the computer interlocking system. Finally, the module is tested in the aspect of hardware, software and integration test, and the results consistently show the electric control module for 25Hz track circuit is highly reliable and available, and it is suitable for signal system in rail transit.