Aiming at the problem of human motion stability boundary identification and fast recognition, a method for judging human motion stability boundary and fast recognition under the influence of multiple factors was proposed. A simple human rigid body model was established to collect motion data. ZMP was used as the criterion of human motion stability, and it was improved according to the actual situation of external interference. The effects of gravity, external force and inertia force on human motion stability were studied, and then the three factors were coupled to achieve the goal of obtaining the boundary of human motion stability under the joint influence of multiple factors by detecting the motion data of sensors.