Abstract: In real-time radar simulation system,a module of Moving Target Detection(MTD) was realized by FPGA, which followed FFT doppler filter method.According to system generality requirements,the standard module interface was defined,and the range gate matix storage format was given.Using pipeline technology,1-RAM centralized structure was designed for saving resources.Then 2-RAM rotation structure was improved for more relaxed timing.Finally,group-sliding MTD circuit was proposed,and the refresh rate for target distance and velocity information increased many times.The results show that,all projects complete expected function,and the process delay reaches microsecond level.