Abstract: The rock stability control around uphill mining under the large angle seam is an important factor in safety and high efficient coal mining . Taking the production practice under the large angle seam in Yangying Mine. The theory of internal and external stress field is quoted to analysis the mechanical problems in uphill mining under under the large angle seam. the support resistance has a relationship with the theory of internal and external stress field in uphill mining . Using the numerical simulation software of UDEC , it simulating the mine pressure law of mining stope under the nearly horizontal and the dipping seam. with the comparative analysis in numerical simulation, the conclusion that specialdistribution law of stress field distribution and plastic zone distribution around uphill mining under the large angle seam, the correctness of the theory of internal and external stress field. on the basis of the above theory , the stability of surrounding rock around uphill mining under the dipping seam is proposed.

Key words: the stability of surrounding rock, internal and external stress field, numerical simulation, the uphill mining