Abstract: After analyzing the history log data of trainwayside wireless communication failure frequent occurrence problem of certain Shanghai Metro line, it is found that vehicle speed, complex environment and base station location are all potentially influencing the communication, deteriorating signaltonoise ratio and causing trainwayside communication failure. From three aspects of reducing interference source, installing signal amplification module and protecting sensitive source, measures and its feasibility of solving train-wayside failure frequent occurrence are expounded. The results of test implementation of certain line show that installing wave filter on RF front-end circuit can significantly lower train-wayside wireless communication failure rate.