The present invention belongs to the technical field of wireless communications and relates to a near-space millimeter wave channel measurement based on a minimum phase system. The invention provides a channel testing method applying the minimum phase system condition to a near space, and solves the problem that a traditional frequency domain measurement method is limited by the cable length, the testing environment and other factors. The core idea of the present invention is to apply the minimum phase system condition to the near space and especially to the channel measurement around the 60 GHz band.