Abstract: By applying the theory of dissipative structure, this paper researches the temporal series and the spatial structure of the reversion process of desertification, and discusses the fluctuations, formation of the dissipative structure, and unbalanced phase change in the reversion process of desertification. It is pointed out that, as an open system, the reversion process of desertification has an orderliness in temporal series, but an un-orderliness in spatial structure, which is a process from the un-orderliness to the orderliness under the mult-i dissipative structure, and has a self-regulation capability under the special conditions. Therefore, in this tridimensional, dynamical and open system jointly composed of the natural environment, living things and humanity, there is not only the entropic increase mechanism of the second law in thermodynamics, but also the inherent negative entropic increase mechanism in biology, the entropic increase represents the desertification process, and the negative entropic increase represents a reversion process of desertification. These provide a new theory for researching the relationships between the balanced stability and orderliness and the unbalanced stability and orderliness, deterioration and reversion, effect of single factor and joint effect of multiple factors, and parts and whole. Moreover it is considered that the conception of the theory of dissipative structure contributes to developing desert ecology related to the "process" so as to enrich the theoretical significance of desertification research.

Key words: reversion process of desertification, theory of dissipative structure, application