Based on the comprehensive analysis and evaluation of natural condition.land use.as well as production level and watershed control in Huangjia Ercha small watershed, the dynamic change and its pattern of land use structure were studied quantitatively.It is thought that the major factors which affect land use structrure are slope land area, total area of landuse, total input and terraced or table land area of the watershed.It is predicted by the models, that the general production value would be increased in the annually averaged rate of 14.5%during 9 years from 1994 to 2000.It Is also found that the optimum proportions of farming, forestry and animal husban击y land area in plan were 52.14%.more than 30%and not more than 15%