Due to strata weathering, soil erosion and other reasons, tunnel surrounding rock is easy to form weathered soil layer, which has a serious impact on tunnel excavation and settlement. In this paper, the arch settlement factors of this kind of earth and stone hybrid surrounding rock will be studied by using continuous-discontinuous numerical simulation method. The results show that the settlement of the vault decreases gradually under the same operating conditions with the increase of rock content, rock minimum particle size and maximum particle size. With the decrease of soil and rock parameters, the amount of vault settlement increases significantly, and the range of vault settlement value is obtained. Finally, the validity of the prediction range is verified by combining the actual engineering conditions of the tunnel. In this paper, the factors of vault settlement are further compared, and the results can provide reference for the prediction design of rock settlement prediction of earth and stone mix.