Polyurethane-imide is a novel kind of po lymer with excellent heat-resistant and mechanical properties. This overview embracing microstructure, synthesis and properties of polyurethane-imide is given and provided representative examples to reflect the state of the research for polyurethane-imide. The microstructure includes molecular structure and phase structure. Synthesis of linear PUI and network PUI is given in next and, Mechanical properties, Thermal performance and other properties is also recommended. The shortages of PUI research is imperfection of synthesis and the theoretical analysis, so the prospect of the study on polyurethane-imide is also displayed.