Abstract: After localization,the LN-LAPS (LiaoNing-Local Analysis and Prediction System) can assimilate the prediction field of T639 and the radiosonde,automatic weather station,FY satellite and Doppler radar data,and output an analyzing field with 3 km×3 km spatial resolution.The basic framework and designing theory of the LN-LAPS were introduced,and its applicability in a rainstorm event occurring over Fushun city of Liaoning province on August 16,2013,was discussed.The results show that the analyzing field produced by the LN-LAPS assimilating with multiple observations can reveal the features of meso-and small-scale convective systems,and help to correct the precipitation region and intensity predicted by the numerical weather prediction models.The strong ascending motion accompanying with abundant water vapor and instability energy in the surroundings indicate the occurrence of this rainstorm.Meanwhile,the cloud microphysical characteristics and radar echo point out the extreme property of this rainstorm process.