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In order to solve the problem of mountain collapse caused by excessive rainfall during flood season, a GIS based rainfall monitoring and warning system for earthquake cracked slope was designed. According to the development standard of GIS platform, WebApp components and other hardware module equipment were connected to complete the summary design of rainfall monitoring and warning system of seismic crack slope. On this basis, according to the geological environment conditions, meteorological and hydrological characteristics and other statistical results, the main requirements of the monitoring and warning system are analyzed. By analyzing the composition of the monitoring and warning system and the structure of the GIS system, the routine GIS system is processed to realize the smooth application of the rainfall monitoring and warning system on the cracked slope. The practical test results show that after the application of the monitoring and early warning system, the maximum data of spatial interpolation of rainfall in the cracked slope is no more than 4.0×1017T, and the risk level of the rainfall area is also significantly reduced. The collapse behavior of the mountain in the cracked zone during the flood season should be effectively controlled.