Abstract: In order to solve the problem of traffic police dealing with emergencies and day-to-day inspections，a rapid identification of vehicle license plates based on Android platform and 4G network transmission is proposed．The method uses a 4G network to transmit pictures taken by a mobile terminal to a remote server to identify the license plate number． Use the license plate number to query the violation information database，and return the query result to the mobile client in real time． As a mobile terminal，a smartphone uses JAVA to layout a UI( User Interface) interface and implement functions such as photographing，display，and information input． With a simple interface，easy operation，and complete system functions，the APP can effectively improve the efficiency of the traffic police in dealing with emergencies and daily inspections，alleviating the problem of traffic congestion caused by law enforcement．

Key words: 4G network, Android platform, license plate recognition, server, database