Abstract: In order to solve the support difficult problems of the large cross section gateway dip in Zhaiyadi Mine, based on the mechanics model established with t he natural equlibrium arch theory, the paper from the theoretical point, analyzed the stressed status of the surrounding rock along the dip of the seam gateway.The nu merical simulation software FLAC3D was applied to individually study the deformation failure law of the gateway surrounding rock under the 3 ~ 6 m different coal pillar width and height.Thus two tensioned failure zones in the surrounding rocks of the large cross section dip gateway were determined as the key location zone.The paper provided that for the completed stability of the large cross section dip gateway, the key location should be the stable support idea to enhance the roof control.The site m easured results showed that with the stability control technology of the HRB335 high strength bolt as well as the diameter 17.8 mm and small borehole pre-stressed anc hor, the deformation of the dip gateway surrounding rock would be within 120 mm and the stability of the dip gateway surrounding rock could be ensured.