Using the basic thought and the related theory of Industrial Engineering, firstly analyze the design of market existing toilet, and do comparative analysis for the crouch and sit contrast. In order to solve the problem of wastewater splashing buttock and squats integration, then make the experiment of splash water and the measurement of squats footprint, and get the data of experiment and measurement. Then propose a set of complete improvement program from three aspects which including the supply way of water, structure of the toilet and the wash way, finally forming system, design a kind of automatic dual water-saving squat toilets, with automatic washing, save water and prevent wastewater splashing buttock, squat amphibious and low cost, and other advantages.