ABSTRACT: Indoor navigation is a fast developing area, but researchers are facing various challenges. One of them is the 3D model that could support the navigation. After reviewing current development of models for indoor navigation, in this paper we generalize essential emergency phases of buildings and clarify requirements for indoor navigation models. Then typical indoor navigation models are compared and their pros and cons are given. Based on these work, we propose a 3D network called “Indoor Visibility Structure”, which makes use of 3D geometry & semantics of buildings and allow for automatic generation of navigation network. The proposed approach is designed to resolve navigation in complex buildings. Ultimately, by relying on the IVS, its updating mechanism, and corresponding routing strategy considering indoor real-time changes, the ‘door-to-door’ navigation within buildings could be achieved.