In the seasonal arid area of upland in Donghai county, there are more erosion and degeneration of ecosystem owing to the greater difference of precipitation yearly and monthly, lower forest cover rate or using soil resources irrationally. (1) To use the advantage terrain positions fully, to dug bayberry of stopping water, to build small reservoir, water pools, big mouth wells, and small mouth wells. All of those were connected to be a soil and water conservation engineering system of upland by settling tanks; (2) To plant trees and grasses persistently, to use soil resources effectively, and build terraces, deeply plough soil, spread technique of contour cultivation, control erosion; (3) To build wells storage and irrigation system, to use surface water and groundwater sufficiently. It is the best way to resolve the deficiency of water in arid area of upland.