To investigate the influence of wind barrier on aerodynamic characteristics of highwayrailway combined bridge under different percentage of opening and height，the three-dimensional model of train bridge wind barrier was meshed，and the reliability of the numerical simulation method was verified by comparing with result from the wind tunnel test. The variation of aerodynamic coefficient of high-speed train and bridge were studied under different air permeability and height of wind barrier. The efficiency of the three-component force coefficient was evaluated using the data development analysis(DEA method)，the optimal wind barrier parameter value was proposed considering the overall aerodynamic performance of the vehicle bridge. The results show that the wind barrier with high air permeability still has a poor wind protection effect，when the height of the wind barrier is increased. The wind barrier can effectively reduce the aerodynamic coefficient of the train on the bridge and increase the drag coefficient of the bridge. Therefore，the aerodynamic performance of the train-bridge system should be considered comprehensively. For the flat-layer road-rail bridge，when the wind barrier height is 3.5m and the air permeability is 20%，the optimum aerodynamic performance of the train-bridge system can be got，and the relative efficiency value obtained is the highest based on the DEA method at this time.