Abstract: Real-time animation of forest has become an integral part of many graphic applications like virtual reality and computer games. In this paper, we present a novel real-time method to simulate forest in wind which maintains physical reality at the same time. In this method, the wind projection is calculated based on the rules of forest meteorology which will take the position of trees in forest into consideration and compute the influence of trees to wind. Instead of physical equation, experience formula in meteorology is employed to accelerate computing process. Users can simulate different kinds of trees by changing coefficients in formulas which can be calculated based on the features of branches and leaves. Experimental results show that the proposed method is effective with highly realism and practical for interactive applications.