A method of quality detection about ground echo intensity and speed of CINRAD/SC new generation Doppler weather radar is proposed in this paper. First, calibrate all the weather radars by same parameters, and collect ground echo intensity data as a template on clear days. Then compare it with realtime echo intensity data. Through phaseshift, the speed data are automatically tested by the sides of error between measured and theoretical values and the echo intensity and speed data is detected and corrected to achieve high detection precision of weather radar.