Abstract: Geological environmental quality evaluation of urban construction land-use is the foundation of urban planning and site choice of construction land-use. Chooses nine indexes such as slope, geologic hazards and so on as the evaluation factors, and divides the evaluation factors' class and select the sensitive factors which are slope、especial soil thickness and geologic hazard on this foundation, through analyzing the background of environmental geology, hydrological geology and field geological investigation of Jiujiang. Then divides the units in the evaluation area, and chooses the grey clustering method to evaluate the geological environmental quality, during the evaluation process adopts the sensitive-factors fuzzy clustering model's advantage. Finally, it concludes that the grey cluster evaluation result is better to accord with practical situation,suit to evaluate the geological environmental quality of construction land-use in Jiujiang and can achieve the aim of providing geologic environmental information for Jiujiang's planning and construcion.