In this paper, an ideal model that equates Wilberforce pendulum with the coupling of spring oscillator and torsion pendulum is verified. The Lagrange dynamic equation of this model is solved. The rationality of the model is verified by designing an experiment and comparing it with the theoretical model. Then, the model is modified according to the comparison results, and a model of Wilberforce pendulum coupling motion phenomenon with closer simulation results is put forward. It is verified that there is coupling force between the up-and-down vibration and horizontal torsion of Webster pendulum, which leads to the conjecture of energy transfer.