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Affected by satellite channel transmission errors, interference signals and rain attenuation, the files broadcasted by CMACast might be lost or received mistakenly at the receiving stations, resulting in an incomplete collection of broadcasting data, which further impacts the forecasting and other meteorological service. To build a data center and provide downloading service through the ground wideband network is an effective solution to cover the shortage of the satellite network. The data downloading client implements data downloading process to better meet the demands of the provincial level downloading service, in which a two stage downloading mechanism is designed and a flexible configurable mode is adopted. The client adopts such technologies as multi level parallel processing and priority based dynamic scheduling in the program. The downloading client has been deployed on the provincial telecommunication systems and received practical benefits in daily meteorological service. The mechanism and implementation of the downloading service are introduced in detail.