Chinese BeidouI was completed in 2000 and has been opened for public use since 2003 The application of BeidouI data in the meteorological field is widely concerned. The feasibility of upper wind sounding with BeidouI is analyzed, experimented and validated. The threedimensional location of the radiosonde is determined in passive positioning way by injecting the realtime height, which is determined by using the realtime highprecision sounding data from radiosondes, into the Beidou positioning unit by twinflight test with the GPS and Beidou radiosondes, so the calculated winds at the sounding level are derived. The deviation between the two systems is about 05 m/s, which proved that the Beidou sounding system preliminarily meets operation requirements.