In order to discuss the changeable weight combination forecasting model and its application in regional ecological risk forecasting,the study was based on the TM image during six periods of 1976,1988,1992,1996,2001and 2003 in Daqing City,northeastern Heilongjiang Province.This study used GIS technology as the data integration analysis platform and obtained land utilization information in different periods of 20 years.The authors determined the weight values of the ecological risk from different land use pat...