Sustainable land use has ever been the same aim of all country government and ecology scientists. However, in reality, theory and method of sustainable development cannot always be implemented into actual land use. One of the main cause is, most research confined in natural branch has emphasized on "what and how should be done" and neglected "what and how is done in reality". On the base of analysis of farmers inspect and investigation on the spot in Mu Us Sandland, a study of actual land use decision making processes and influential factors in that process was paid to the arid and semi arid zone, Northwest China. Differences of those three social groups on standpoint, view and influential force in the process of land use decision making were discussed.