Abstract: It is identified in the study that the misuse of fixed-dunes in desert steppe is the key factor to cause land desertification, on the basis of the analysis and measurement of dune moisture of different condition. By observing dune moisture, some evidences for making good use of sandy lands and for accelerating the dune stablization are presented and discussed in the paper.. 1) The replenishment of the moisture in sand dunes depends upon the precipitation in the case that dunes are independent of underground water. The depth of rain-wetted sand is related in proportion to the amount of each rainfalll. 2) The moisture condition of sand dune will be gradually worsened when shifting sands have been stablizid by vegetations. The available moistures from April to July in shifting sand dunes, semi-fixed and fixed dunes average 102.46mm, 51.79mm and 41.09mm respectively. 3)After the sand dunes have been fixed a thin crust will be formed on the dune surface. The runoff occurs in the fixed -dune areas and drains into the interdu'ne areas under the case of high intensive rainfall, and so that the moisture content in the interdune areas is higher than that of the fixed sand dunes. 4) It is feasible to reclaim the interdune areas in a proper manner on the basis of consideration of local moisture regime and topographic condition.