The prominent correlative period of electricity supply and weather conditions was obtained by pertinent analysis for 1988-1998 data in Shenyang.The quantity relationship of monthly power supply and monthly temperature anomalous,monthly precipitation anomalous percentage and the quantity relationship of daily power supply and temperature,precipitation etc.were calculated based on distilling weather electricity quantity by means of nonlinear curve fitting.Then,the prediction system of monthly and daily electricity supply was established according to the routine weather forecast,which provided special products for the electricity department.