Gray-fuzzy clustering theory is applicated,and the indicating system of the district evaluation,the considerate evaluation of the weight and the gray connection analysis district differently optimal are analyzed.

Division evaluation and counter-measure of cropland sustainable utilization in Fujian Province;

Water Resources Assessment for Holudao City;

The assessment of the susceptibility of geological hazards in Kangding county town is made with the aid of the discriminant formulas and scores presented in this study.

Grey system theory has been firstly applied to the zoning evaluation on regional stability of the Pearl River Delta, and a mathematical model of grey system has been established in this paper.