Abstract: Drought is one of the most common environment stresses. In China, especially in North China, drought is the most serious limiting factor for agricultural production. Researches on drought resistance mechanism have been being a hot spot for many years, and various kinds of morphological and physiological indexes for drought resistance have been put forward, but so far, the study on drought resistance mechanism is not in- depth, and the indexes put forward are not perfect in practice. This paper showed the views for drought resistance mechanism in plant.