Abstract: For the tunnel supporting design in mountain area, the determining factor is the calculation for surrounding rock pressure in shallow tunnel under asymmetrical loading in bedded geological strata. The calculation model for surrounding rock pressure in shallow tunnel under asymmetrical loading in bedded geological strata is lacking in the present, thus this model is urgently needed. There are multi-layers bedded geological strata above the tunnel which have different properties. Then, forces of polygonal blocks on both sides of potential slip planes are analyzed, and the resultant forces of side resistance in potential slip planes are obtained by the equilibrium equations of forces and torques. Furthermore, the calculation equations of surrounding rock pressure in both vertical and horizontal directions can be obtained. Finally, the calculation model for the surrounding rock pressure of shallow tunnel under asymmetrical loading in bedded geological strata is proposed. It is found that this calculation model can transform to the general model for surrounding rock pressure in shallow tunnel under asymmetrical loading. The surrounding rock pressures in the vertical direction predicted by the calculation model and finite element simulation are similar, but it in the horizontal direction predicted by the calculation model is smaller than that predicted by the finite element simulation.