  This article adopts game theory to build a model for explaining the predation
behavior of animals.We assume that both the prey and the preydator have two
stratigies in this game,the active one and the passive one.By calculating the
outcome and the income of energy in different stratigies, we find the solution
to analyze the different evolution path of both the prey and the predator.A
simulation result approximately represents the correctness of our model.
