@@ 1 Introduction AREM modelis a heavy rainfall numerical prediction model with China's own intellectual property right which take into account our country's unique topography and climate characteristics, so it has comprehensive application basis in the field of meteorology, hydrology and environment. AREM operational version has been running in Wuhan Institute of Heavy Rain since 2003. Many aspects of the AREM model, including background fields, objective analysis method, boundary condition, the top height of model, and forecast period, was upgraded and improved to enhance heavy rain forecast accuracy in recent years. AREM improved version were developed in July 2007. Based on the AREM model platform the rapid update cycle (RUC) version and ensemble prediction model have been developed and put into operational use. So a complete AREM prediction system consist of operational model, improved model, RUC model and ensemble model was been constructed. Then the forecast effect and character of the member of the AREM prediction system was the focus for the forecaster and the model developer.
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