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Vehicle-ground wireless communication is the basis of urban rail transit signal systems. Handover performance is not only an important indicator of wireless communication quality, but also an important factor affecting the transmission of train control information. During the operation and maintenance of the Guangzhou Metro, it was found through analysis of the log that handover performance is an important factor limiting the wireless communication performance of trains and grounds Therefore, a WLAN handover algorithm based on linear regression prediction is proposed. For wireless communication methods of WLAN standard, using the received signal strength of the currently connected Access Point, the received signal strength of the Access Point to be connected, and the train position as parameters, calculate the prediction function. The handover trigger decision is made based on the two kinds of predicted received signal strength value, which improves WLAN handover performance, thereby improving car-ground wireless communication performance. The experimental and simulation based on the test data of a Guangzhou Metro line results show that the method works well.