The distribution laws of soil enzymes of Talimu Desert Highway Shelter-forest and the effects of soil or- ganic matter on them were studied. The results show that the activities of soil enzymes increased sharply

the dis- tribution of soil enzymes had distinct laws with time elapse and variation of space

and soil structure and nutrient status were improved with greenbelt set up under condition of irrigating by saline water. By analysis of path coef- ficient

soil proteinase had the largest direct effect on soil organic matter

neutral phosphatase

uraease

invertase

alkline phosphatase and catalase ranked in order. The interactions between pairs of neutral phosphatase-alkline phosphatase

alkline phosphatase-neutral phosphatase

uraease-neutral phosphatase

proteinase-neutral phos- phatase had larger effects on soil organic matter.