Abstract: A system for quantitative precipitation analysis and applications are briefly introduced. A successful application includes the structure analysis of a precipitation system, the development of a new convective-stratiform precipitation separation, the physical definitions of maximum precipitation and precipitation efficiency, the physical mechanisms of diurnal cycle of tropical rainfall and rainfall responses to radiation and ice clouds, and temporal and spatial constraints for accurate precipitation modeling. The system provides an unified physical framework for studying dynamic, thermodynamic and cloud microphysical processes associated with precipitation.