Aiming at the roadway asymmetric deformation within inclined rock strata, the mechanics model of roadway sidewalls is built. The analysis shows that the surrounding rock tensile failure of long side is likely to occur under downward tension of inclined rock strata and strata normal direction stress, whereas the surrounding rock of short side is relatively stable under strata normal direction and inclined rock strata stress. According to the numerical simulation analysis of different dip angles by UDEC(Universal Distinct Element Code), it is found that the structure asymmetric deformation of the inclined rock strata roadway has three characteristics as follows: (1)the high side deformation degree is greater than that of low side within roadway; (2)the dip angles of rock strata increases, it naturally follows the sidewalls horizontal deformation degree and the increase of high side horizontal deformation degree is faster than that of low side, while the sidewalls vertical deformation degree increases at first and gradually decreases when the dip angles of rock strata increases; (3)the high side vertical displacement presents the greatest degree at the base angle and decreases with the height increases, while the low side vertical displacement presents the slightest degree at the base angle and increases with the height increase.