Abstract: The basic principle and method using Hartmann-shack method to calibrate plane beam is derived in this paper. Some experiments are also done to calibrate incident beam. The incident beam going through the subapertures of Hartmann system projects on the focal plane to form light spots. If the average value of space between the projecting neighbouring light spot centres is larger than the ideal plane beam case, the calibrated beam is divergent; in the smaller case, the calibraged beam is convergent. The calibration method has the advantages of simple principle and convenient operation