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The transmission mode and timeliness of single station radar data transmission and interprovincial radar data exchange are analyzed. The influencing factors of radar data transmission timeliness and the improvement measures are given. The results show that by using the single radar data transmission based on ROSE and regional radar synchronization observation, it can be ensured that radar base data and products of the province and the surrounding to reach the forecasters’ desktop within 1 minute. Compared with the interprovincial radar data from the new generation communication system, the regional synchronous observation requires less communication bandwidth and higher time effectiveness. The improvement of the radar data transmission and communication line, and the operation of the integrated use of a variety of realtime transmission modes are introduced, which provides a reference for the improvement of radar data transmission in order to meet the timeliness requirement of meteorological service for radar data.