The delay time of echo generated by the moving target simulator is discrete, and the moving trace of simulated target is discontinuous. In order to solve this problem, firstly, the radar digital signal processor must adjust the range gate, and the range error will be limited within one range cell. Then the rest error cannot be removed but can be adjusted by phase pre-compensation in simulator. The idea is that let the phase of simulated target be equal to the one of the real target at sampling time. After the phase pre-compensation, a real continuously moving target will be generated and the problem will be solved. Then MATLAB simulation of the method is done for linear frequency modulation radar system. The simulated results can be used to validate the effectiveness of the method.