The lateral pressure coefficient has greater influence on the stability of tunnel surround rock and also has certain relation with the section form of tunnel. While the stability of tunnel surround rock is reflected by its displacement to a certain extent. The paper established the joint rock tunnel model of three section forms, and simulated and analyzed the displacement response in different buried depth and lateral pressure coefficient respectively. The response rule of three section forms was obtained for these tunnels in the change of lateral pressure coefficient. Through example summary, the conclusions are that when the lateral pressure coefficient is identical, the bigger the depth of tunnel, the bigger the displacement of tunnel key point, and the displacement is strong impacted by the buried depth when the lateral pressure coefficient is big; In the same buried depth of tunnel ,the tunnel rock''s displacement is slightly influenced by the lateral pressure coefficient when it is small, but the change of displacement is significant as the lateral pressure coefficient is larger; The critical points of the tunnel biggest displacement is located at different positions when the depth and lateral pressure coefficient are the biggest. The simulation in the context can provide reference for the choice of tunnel section form and guide for joint rock tunnel excavation and supporting.