The gestures of the ground commander are an important part of the air command movement.In view of the current low timeliness of gesture segmentation and inaccurate short sequence segmentation, this paper proposes a real-time dynamic gesture segmentation method.Firstly, OpenPose is used to extract the key position information of the hand, calculate the angular feature and length feature sequence of the hand vertex and base point, extract the subsequence through the sliding window, and compare the mean of the subsequence with the mean of the previous subsequence.The threshold method is used to find a point that satisfies the threshold condition from the subsequence, i.e.the sequence division point.This paper constructs a database of gesture instructions.Compared with that of manual annotation, the segmentation of the proposed method is more accurate, and the accuracy is above 90% with high timeliness.