Abstract: Carsharing can effectively relieve traffic congestion and pollution in cities.It is considered as an alternative trip mode to private cars, and has significant effects on choosing behaviors of travelers.Based on Evolutionary Game Theory, a game process of traveler's trip mode between carsharing and private cars is analyzed.Based on choosing behavior of travelers, an evolution game model is established.This model focuses on different features of trip mode by carsharing and private cars, service level of carsharing changes with number of travelers, and government participation in management.Stable conditions of equilibrium points are obtained under different model parameters based on dynamics.The analysis results of evolutionary stable state may provide support for promotion of carsharing and setting of government policy.