Abstract: Radar signal simulation is important in modem radar system. With the development of semiconductor technology,the clock frequency and interface bandwidth of FPGA chip are improved rapidly. These made it possible that using high performance FPGA and high speed DAC chip to generate wideband radar signal becomes possible. This paper presents a radar signal simulation system based on Virtex-4 FPGA which is the newest generation of FPGA from Xilinx Inc. The system is capable of up to l Gsps transfer data rate, 14 bit resolution. Testing result is provided in the end.