Abstract: This paper has explored the effects on temperature,moisture,physical character,nutrient content in the soil and growth of R.pseuduacacia by soil mulching with single-layer,double-layer and non mulching.Through afforestation test on the soil of plastic mulching with R.pseuduacacia,it shows that plastic mulching has obvious effect on temperature-increasement and evident effect on moisture-profection to soil layers.It can significantly increase water content in soil,survival percent and growth increment of R.pseuduacacia and also has certain degree of improvement on soil structure.