Based on the train pressure measurement experiments，the influences of wind barrier on the wind pressure distribution of the train surface on a highway and railway same-story bridge and CRH2 train are analyzed. The change rules of the correlation between the train surface pressure and the aerodynamic force are also studied with/without considering the wind barrier. The results show that when the wind barrier is set，the air pressure differences between the windward and leeward side，top and bottom of the train decrease with the reduction of the air permeability of the wind barrier，which makes the overall side force and lift of the train reduce. When the air permeability of the wind barrier is 20%，the fluctuating pressure distribution on the train surface is uniform，which is conducive to the safety and comfort of the train running on the bridge. The windproof effects of the wind barrier do not always get better with the increase of the height of the wind barrier. When the air permeability is 40%，the wind barrier has an optimal height of 3.5 m. The influence of the air permeability of the air barrier on the surface wind pressure of the windward side and the arc transition section of the top side of the train are obviously greater than those of the height. After the wind barrier is set，the pressure cross-correlation between the measuring points on the bottom and the leeward side of the train is better. The wind barrier effect enhances the consistency of the two parts of the flow fields，and makes the falling point of the fluid more consistent. With the increase of span distance，the correlation of aerodynamic force gets worse. The correlation of wind barrier to aerodynamic force is weaker than that without the wind barrier. When the wind barrier is set，the aerodynamic force is completely irrelevant when the span distance is more than 5 times of the train height.