The weather radar product with high time and accurate features plays an important role in monitoring, forecasting and early warning of severe weather. In order to improve the processing efficiency of radar product, A radar data mosaic system based on the "cloud + client" technical structure was designed and developed in Jiangxi province. Many scheduling mechanisms, such as data source perception, sequential tasks, timing tasks and so on, were used in this system, so radar data quality control, data gridded and data mosaicked were fast realized. According to the intensification and unified operation monitor ideas, the whole process monitoring and abnormal alarming functions in the radar mosaic plotting system were developed. Depending on the data and computing resources provided by "Tian Qing", a distributed and parallel system operation environment was constructed, and 22 Doppler weather radars in Jiangxi Province and surrounding provinces were fast mosaicked, then the radar products of single station and network stations with 6 minutes and 1 km resolution were real-time made in Jiangxi province. The products were written back into "Tian Qing" for unified and standardized storage management, which provides important data support for the refinement meteorological business in the whole province. The radar data mosaic system based on "Tian Qing" unified production line scheduling has significantly improved the time efficiency of data processing. This research provides an important technical reference for promoting the construction of new “cloud + client” meteorological business.