Abstract: Based on the mobile Ad hoc networks with the group mobility model, the principle of the original landmark hierarchical routing protocol (LANMAR) is analyzed. On the basis of the landmark routing protocol, a physical hierarchical structure with backbone nodes, including channel setting and access methods, is designed, which can satisfy the requirements of the mobile Ad hoc network. A novel LANMAR protocol with designated clusterheads is proposed, which is called designated clusterhead LANMAR (DC-LANMAR). The clusterhead has powerful radios and use high quality backbone links to communicate among groups to reduce hop distances. The main performances of LANMAR and DC-LANMAR are compared through computer simulations. The results verifies the feasibility and effectiveness of DC-LANMAR protocol.