The site factors of hillsides closed to afforest in southern Shaawi Province are divided into seven types using fuzzy cluster by progressive modification from centre

including the types of thick soil

gentle slope

rich rainfall with high elevation

rich rainfall with low elevation，poor rainfall with high elev0ation

poor rainfall with low elevation and stern slo pe in order

Among the seven types

the most advantages is tim first type

then the second to the sixth

th.e poorest is the seventh

the type of si;eep slope

The results demonstrate that this kind of quantitative cluster analysis method is characterized with fast result and objective

seientiific

simple and com0enient nature when used to divide the type of site factors of hillsides closed to afforest.