At present， most scholars at home and abroad usually focus on the stress and deformation of landslide body caused by tunnel excavation. There are few studies on the force， deformation and reinforcement of existing tunnel structures under the influence of landslide. Based on the issue， a new combined reinforcement system of pile and cable in existing tunnel is proposed，where the anti-slide piles， anchor cables and tunnel lining are integrated， which is very different from the traditional study by the separated type between tunnel reinforcement and landslide treatment. However， due to its theoretical research lags far behind engineering practice， it limits the application in engineering practice. In order to study the stress and deformation of the reinforcement measures of the existing tunnel in landslide scope， three geo-mechanical model tests in case of vertical crossing direction are established to study the interaction rules between the landslide and the tunnel structure. It includes the ones without reinforcements，with anti-slide pile reinforcements and with combined anti-slide pile and anchor cable reinforcements. It is found that the test data change significantly after the reinforcement measures are applied. Especially in the combined anti-slide pile and anchor cable reinforcement system， the tunnels， the anti-slide piles and the anchor cables form a new structural system with higher carrying capacity and stability， which can ensure the operational safety of the existing tunnel. The results can provide a theoretical basis for the service reinforcements of the tunnel in the landslide mountain scope.