Abstract: In the transmission of radar data which are transmitted from radar station to national communication system, there may be missed some data due to network and other reasons. Through analyzing the current situation of the radar data transmission and the reasons of the missing data, we designed variety of packet formats, established the retransmission strategy and processing logic, and standardized the retransmission protocols between radar station, provincial and national communication system. And through the nationwide test, it is veri fied that the data stream retransmission mechanism can effectively avoid the missing data problem and ensure the integrity of transmission.