To efficiently control and improve the deteriorating ecological environment in the residual loess platform region we should develop the land resources on the basis of economics.This paper provides a method of evaluating the suitability of land development to deal with the problems of developing land resources. First, from various environmental factors four of them are picked out. They are land types, slope, slope aspect and elevation, which can stand for the difference among land facets. Then by using the method the suitability 644 land facets have been evaluated in the residual loess platform region in Xixian county of Shanxi province. This serves as an important sample region for fulfilling the Eighth Five-Year Plan of the state. It has proved that the actual effect is good.