From a new viewpoint of transportation efficiency,authors propose the aggregative total travel time to measure the level of transportation efficiency and macro-accessibility of one given land-use pattern. By dividing the total travel time into aggregative inter-group travel time and intra-group travel time,authors deduce the function of total travel time and establish an urban land-use optimum model, which can maximize the transportation efficiency and macro-accessibility under certain restrictions of economy, land and population. Finally,authors attempt to solve the optimum model from the viewpoint of integrated urban land-use,transportation system planning and propose a solving method which can realize the circular relationship between urban land-use pattern and transportation system.