The geological hazards can be induced by both manmade and natural fa c tors. Precipitation may be the most important factor under a certain geological structure and environmental conditions. The early warning and prediction system of abrupt geological hazard in Ningbo would be very efficient and feasible in th e operation, which is based on artificial neural network (ANN) and geographica l information system (GIS), combined with rainfall factor from surface mesoscale observation system and highprecision grid rainfall amount forecasted by WRF mo d el and relied on MICAPS to achieve quick subjective correction by forecasters.