In this Paper through the investigation and surveying for Dicranopteris Linearis of water-holding capacity of theplant's stems and leaves,surfact - tempretate, Pricipitation eraperation and Soil water and analysis of its ecologicalcharcteristics and its benefit of water and soil conservation,It was showed that Dicranopteris Linenris adapts to grow insubtropical zone with higher humidity,tempreture and more rainfall. The plant gives significant benifit to conserve wa-ter and soil on slope land,And also it bringes economy and society benefies.