Concept and science issues,research methodology and research way of Arid Environment Dynamics are advanced based on the current situation of research on the arid environment.A scientific Frame is provided forest abolishing the Arid environment Dynamics.Arid environment system is apart of the Earth system.It consists of physical climate part-system (be Called for short the climate system) and ecology-soil part-system.But the arid environment system is controlled and influenced by ancient climate system in obvious long timescale(above thousands years),and by human activity in obvious short time scale(years to decades).Due to the arid environment system is apart of environmental system,it interacts with exterior environment.Moreover,the arid environment system can be regarded as a huge system that is constituent with above part systems.It is the statistical summation of sundry physical,chemical,biological processes and interaction generating inside each part-systems.And the ancient climate system that is obvious long time scale may proximately be seen as fixed initial condition or boundary condition, but human activity that is obvious short time scale can be treated as disturbance or force to arid environmental system.The Arid Environment Dynamics can be developed on the base of the fundamentals of the Earth system science.But it should be emphasized to study on orderliness and trend of evolution of the arid environment in scales of decade and a hundred years in the Earth system science,especially,human activity influences on arid environment in the scales.In order to study arid environment problem,such natural science disciplines as geography,biology,Atmospheric science.Water conservancy,geology must form uniform stand point and universal methodology, sequentially come into Arid Environment dynamics that is comparatively independence even subject intercross.The Climate Dynamics are already comparatively maturity,so that the mathematical model of the Arid Environment Dynamics may be based on the Climate Dynamics.The key to develop the model is how to express volumes of ecology process as the volume of physics and chemistry,how to establish mathematical model of hydrographic subsystem,ecological subsystem and soil subsystem,and intercouple with the model of Climate Dynamics.