Based on basic products of Doppler radar volume-scan data, the secondary products can be calculated. Combining these new products with national GIS data, the real-time processing system of Doppler radar data was developed. This command system can convert the volume data into PPI, CAPPI, ETPPI, CR, VIL, RHI and VCS products automatically. Also the system established the forecast model for weather modification. It greatly improves the command capability for prefecture-level rain enhancement and hail suppression operations.