In recent years, the China SAR (Synthetic Aperture Radar, SAR) satellites, including Gaofen-3 satellite (GF3), Environmental disaster reduction 2E satellite (HJ2E) and Land Exploration 1A satellite (LT1A), covering three different frequency bands (C-band, S-band, L-band), were launched. They all have polarimetric SAR imaging mode, which can apply to ecological civilization construction and sustainable development. To form standard PolSAR (Polarimetric Synthetic Aperture Radar, PolSAR) application products according to the characteristics of domestic polarized SAR satellites and apply them to natural environment monitoring and disaster detecting is of great significance. This paper mainly resolves key technology of PolSAR data processing, explores a set of flow generation technology of domestic polarized SAR satellite products (PolSAR classification and PolSAR orthorectified products), and verifies the accuracy of the products in engineering application. An automatic PolSAR data processing system of China C/S/L band SAR satellites is constructed. Considering polarization characteristics of three different bands satellites, PolSAR orthorectified product generation and land classification mapping under rare control points were carried out on three domestic SAR satellites in three study areas, and the corresponding accuracy was evaluated. The engineering application results show that the orthoimage rectification accuracy of China PolSAR satellites in the three study areas is 1.5 pixel, 1.9 pixel and 1.7 pixel respectively, all of which are better than 2 pixel. The overall accuracy of land classification mapping obtained is 85.25%, 80.15% and 87.02%, respectively. The Kappa coefficients are 0.75, 0.72 and 0.81, which can meet the application accuracy of natural environment monitoring and disaster detecting. It provides a scientific reference for the further application and research of domestic PolSAR satellites.