The system of synthetic aperture radar imaging based on vector network analyzer and sliding rail, which are general equipments in laboratory, can acquire lowcost data to validate the theory and algorithm of imaging and provide effective validation of real system construction. The combined control of vector network analyzer and sliding rail by C# codes and the “StopGo” method of measurement for objects are demonstrated. At last, through the timedelay characteristics of the measured data of S21 parameter, the objects are twodimensionally imaged by range and azimuth processing. In compare with the real spatial positions of the objects, the system is proved to be valid and effective.