Abstract: Based on GIS technology, the real-time precipitation analysis system enables the data of rainfall database in GIS platform on the electronic map-related monitoring point to reflect real-time precipitation dynamically and represent itself in the form of color map, chart, diagram, providing open information for the dynamic rainfall monitoring information sharing. At the same time this system makes the close-to-precipitation forecast possible in the future 3, 6, 9, 12, 15, 18, 21, 24 hours according to the prediction model and the subsequent precipitation forecast easier according to the actual rainfall, truly realizing the early warning of precipitation function. It is also possible for the system to realize the intelligent analysis of any time rainfall, including automatically generating rainfall analysis content and SMS rainfall content. The application of the system will realize the timing, fi xed point, quantitative analysis near the precipitation forecast business so as to assist staff to make correct and timely decisions.