Abstract: The digital array MST radar is an active phased-array meteorological radar, which measures winds in middle-atmosphere,stratosphere and troposphere. The radar applies distributing solid transmitter technology and digital beamforming technology, whichcan decrease the complexities of hardware, and improve the capability of radar, also adapt to the exploration of complex weatherprocesses. The technology of amplitude and phase calibration is one of the key technologies to digital array radars, which can improve the amplitude-phase consistence of radar, and can also improve the capability of radar. The composition of the radar is presented at first, and the method of amplitude and phase calibration is discussed with matrix analysis,and then a design of amplitudeand phase calibration system is given, at last a true result is given.