Abstract: In view of the practical engineering problems, that 22103 working face will across -413 level main roadway roof，cross-mining method is used to realize continuous mining. By using theoretical analysis method, we estimated that the minimum roadway safety rock pillar thickness is 5.9 m. According to the results of calculation, drilling parameters of main roadway and spatial position relationship between working face and floor roadway, a protective coal pillar with the shape of right-angled trapezoid is reserved. During the period of cross-mining, the main roadway under floor is segmented support influenced by mining, and a lot of monitor points are set along the roadway to observe strata behaviors. The results shows that there are differences in surrounding rock deformation of different sections along main roadway, deformation law of surrounding rock of two main roadway is basically identical, that the deformation of surrounding rock is gradually decreased from the middle to two ends of face. The maximum roof subsidence is 112 mm and the maximum two-side convergence is 91 mm, which are within controllable range.