Typhoon and local rainstorm are the primary meteorological disaster in summer fl ood season in Zhejiang. The principal method is based on the primary radar infor mation in the threedimensional variation assimilation for typhoon nowcasting t echnique and research. Automatic echo identification, echotracking and precipi tation estimation are developed by researching the radar information of last yea rs and modulating the parameter for local. The crosscorrelation technique and centroid method are used for strong convection echo identification and tracking. The moving direction tendency of the mesoscale convective cloud clusters and th e realtime data of autoprecipitation station are considered. The dynamic pre cipitation is evaluated by applying the bestprobabilitywindows to get the mo st suited ZI relationship. Through the retrieved variation correction, the rainstorm nowcasting within 1 hour is made by use of linear extrapolation. Cons idering the requirement of typhoon shorttime forecast service, the system cont ains the rapid diagnostic analysis for typhoon center and mesoscale circulation pattern based on GBVTD (Groundbase Velocity Track Display method). As a workin g platform，the system can be used for disaster weather forecasting and service.