Abstract: To make a qiqi of a simple structure that can be easily processed, an eccentric design is proposed, and MATLAB and Pro/E are used to establish the mathematical model and the 3D solid model. The position of the center of gravity of the qiqi is simulated on this basis, and the feasible hanging region concept is proposed. The impact of several important structure parameters on the size of the feasible hanging region is analyzed, the qiqi can thus be designed with related parameters optimized. The real qiqi is manufactured, and the experiment confirms the desired effect.