In order to study the influence of cross wind on pantograph-catenary dynamic behaviors, the stochastic wind field of pantograph-catenary system was established to obtain the wind speed time series on the pantograph and catenary based on the linear filtering method of AR model and the Davenport power spectrum. The aerodynamic model of pantograph/high-speed train was built and the computational fluid dynamics method was used to calculate the aerodynamic uplift forces of the pantograph for different cross wind speeds while the train running at a speed of 300 km/h, then the time series of aerodynamic uplift force was obtained under the average wind speed of 20m/s. The three dimensional pantograph-catenary coupled dynamic model was used to analyze the influence rule of the cross wind on pantograph-catenary dynamic systematically. The results show that the aerodynamic uplift force of the pantograph is increased while it is acted by cross wind and is directly proportional to the square of the cross wind speed. Moreover, the increase and fluctuation of the pantograph aerodynamic uplift force induced by the cross wind make the mean and standard deviation of the contact force increased. The contact status between the collector strip and the contact wire is changed due to the wind-induced vibration of the catenary which increases the fluctuation range of the contact force. Therefore, while the train running in the cross wind environment, not only the contact force is increased and will intensify the abrasion of the collector strip and the contact wire, but also the current collection quality is deteriorated because of the minimum value of the contact force decreased while the standard deviation increased.