To solve the problem that the TACAN equipment has limited capacity of field test, a TACAN signal detection system was designed by taking FPGA as the core of the control system, using DSP to implement the secondary information decoding, and a embedded configuration software to build the Human-Machine Interface (HMI).In this paper, the hardware and software composition is presented, and the software flow chart is given.The communication module design and angle/distance detection process are described with the improved algorithms.The system makes full use of capabilities of FPGA in high-speed sampling and parallel processing and of DSP in real-time computing, thus to realize rapid calculation and display control.The experiment result shows that the design has a good test precision, and it can improve the level of the maintenance and service, which is valuable in engineering.