Skyevtol provides UAV service for different public security scenario, which request low cost, high flexible, maneuverable and stable. Skyevtol's V330/V330A system could finish surveilance from the top, routine patroling, searching and tracing. The police department can take use of V330/V330A to deal with emergency and tracing the suspects, the traffic department could do traffic control,  even the jial management could use be benifit from the patrolling service of high efficient UAV.