The implementation of an up-to-date multi-channel radiation detecting system based on WSN(wireless sensor network)is presented in this paper. The technical points of software and hardware, such as using G-M tube as a detector, time-to-count measurement method and WSN, are also described in detail. Wireless sensor network is the one with which a number of sensor nodes are self-organized through wireless communication. And it can implement data detecting, acquiring, processing and transmitting real-timely and concurrently. For the purpose of improving the reliability of data transmission, the system is made up of three-tiered heterogeneous architecture consisting of detecting node, sinking node and central control node.