A new signal control system for railway stations, fault-tolerant all- electronic computer interlocking control system, is proposed,in which the computer-based interlocking system layer is constituted through the implementation of electronic security unit replacing the Relay, and the all-electronic fault-tolerant controlling for whole system is fulfilled through two of three fault-tolerant computer system. Furthermore, the overall structure, function and fault-tolerant security designing of the system are discussed in detail. The system can meet the requirements of high reliability, availability and real-time controlling, it also can monitor the external equipments and their own equipments real-timely. The system has been put into operation and run stably and reliabl.