根据目前干旱环境研完的现状，提出了“干旱环境动力学”的概念及其科学问题提法、研究方法论和研究途径，为干旱环境动力学的建立提供了一个科学框架。干旱环境系统是地球系统的一部分，建立干旱环境动力学．应以地球系统科学的基本原理为出发点。但它应着重研究地球系统科学中十至百年时间尺度干旱环境发展规律和趋势，特别是人类活动在该时间尺度内对干旱环境的影响。为了研究干旱环境问题，自然科学领域的地理科学、生物科学、大气科学、水文和水利以及地质学等必须形成统一的观点和最普适的方法论，从而形成相对独立且学科交叉的干旱环境动力学。气候动力学已相时成熟，干旱环境动力学建模可以气候动力学为基础。建模成败的关键是如何将生态过程物理化和化学化，如何建立水文子系统、生态子系统和土壤子系统的教学模型，并与气候动力学模式相互耦合。

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.