Abstract: Based on the conventional observation and Doppler radar detection in Beijing and Tianjin,the radar echo characteristics of a severe convective weather process occurred in Langfang City,Hebei Province at the night of June 25,2020 was analyzed.It shows that,the background condition of the supercell storm is the high slot in front of high-altitude cold vortex overlapped with the ground cold front system.A favorable environment for the development of the convective weather process are also provided by a high convective available potential energy （CAPE）value and strong vertical wind shear as well as an appropriate altitude of the layer with temperature between 0℃and 20℃.This supercell storm belongs to a right-ward moving strong storm,and the echo shape changes constantly during the development and evolution process with the mesocyclone feature persistence.The vertical structure of the echo shows typical characteristics of supercell radar echo,including echo wall-hanging echo,bounded weak echo area-three body scatter signature and sidelobe echo.In this process,the strong echo of 55 dBZ and above extends to the upper level rapidly and then falls down swiftly companied with a low strong-echo centroid height,which predicts that there would be a large hail and disastrous wind near the ground.The maximum value of vertically integrated liquid（VIL）around 55 kg/m~2could be used as a local indicator for issue hail warning,which could advance the hail warning time by 12 minutes.The VIL value up to 40 kg/m~2could be the warning indicator of the surface disaster gale,which is capable of advancing thunderstorm gale warning time by 24 minutes.