Abstract: VPP retrieval algorithm shows good performance among the central region of micro scale wind filed. But on the edge, the wind field changes dramatically, destroys the continuity, and makes the retrieval method invalid. The method of identifying and locating the interference inversion region was studied. It was derived that horizontal tangential wind speed was the same at the same radial, thus the initial inversion results were corrected. An improved algorithm was put forward. The experiment was conducted using simulated doppler lidar data to prove the method, and it is proved to be effective.