The weather forecast system for heavy snow over Chuanxi Plateau in Sichuan province was developed by using the historical weather records of heavy snow on Aba grass land and combining an elementary model with BP artificial neural network.The system is automated to collect the interrelated factors and output the conclusion by using the data information from the Project 9210.Then new factors were automatically added to the data base, and the forecast accruacy for heavy snow of the forecast system was improved.