Abstract: A review was conducted to study the double effects,lag effect and compensation effect of the plants, on rewatering after water stress. The unfavorable effects of water stress on plant can be compensated completely or partly,depending on the extent and sustainable time of water stress.Whether the compensatory effect exists or not is the focus in biological studies in the world.Establishing a time-lag simulation model to explain the effects of soil water conditions on crop growth from the view of whole plants is an important studying target based on the knowledge of crop growth and water relationship and the double effects of crop on the fluctuation of soil moisture.