Abstract: The average wind speed in the southeastern Wuhan is dominated by soft breeze, which decreases slowly in central urban area with heat island being concentrated, while keeping stable fluctuation in suburbs with no heat island in most areas. The study constructs a marco ventilation corridor system in the southeastern Wuhan, and then performs numerical sensitivity experiments to examine impacts of three-typed corridors on the meteorological fields around the surrounding areas by WRF. The simulation period is set on 18th July 2018 with the prevailing southeast wind. Two ventilation corridors are first set up, which are parallel and perpendicular to the prevailing wind, respectively. The results indicate that the urban ventilation corrisor can decrease temperature, increase humidity and wind speed. Compared with no corridors, the corridor parallel to the prevailing wind can make the near surface temperature dropping by 1.4℃, the relative humidity increasing by 8% and the wind speed increasing by 1.4 m·s^-1. The effect of cooling and humidifying is obvious within a vetical height of 100 m, and the wind speed increase by 1 m·s^-1 at 120 m. The effect of the corridor perpendicular to the prevailing wind on temperature, humidity and wind speed is weaker than that of the parallel one, and the effect of the composite corridors is basically the same as that of the single one. The influence of ventilation corridors on temperature and humidity extends downstream along the wind, but little on wind speed. The temperature decreases by 0.98℃ and the relative humidity increases by 5.93% for 1 km downwind of the corridor parallel to the prevailing wind, while 0.46℃ and 3.12% respectively for 2 km. The study shows that the ventilation corridors are designed to connect the suburban green space and water body with the central heat island area by the prevailing east wind, which introduce the cold natural wind and export the urban hot air to form local convection for alleviating urban heat island.