In order to economize energy resources and reduce pollution and to build a resources-economized society,the meteorological conditions and forecasting methods for heating in winter in Xi'an were studied.According to the National Heating Regulations in China and the heating situation in winter in Xi'an,an analysis was made of the day-to-day meteorological data during the heating period in winter from July 1951 to June 2003 in Xi'an.The first day and last day of heating in winter are confirmed by comparing three different statistical methods recommended in the related national regulations.By making good use of T213 numerical forecasting products,the correlative analyses were conducted between the various day-to-day meteorological factors at different times at 850 hPa and 500 hPa and the corresponding actual temperature during heating periods in winter in Xi'an.A regression analysis method of day-to-day temperature forecasting during heating period in winter is put forward.