Abstract: In this paper, the analysis model of crustal vertical movement is established based on the hypothesis of the global flux isostatic datum, and its harmonic function series solution is proposed.The solution to the deformation field of the crustal vertical movement in the Bohai Gulf area has been fitted and its isoline map has been complied.Comparing this model with harmonic analysis model, this paper indicates that this model is better and more rigorous in theory.Furthermore the Fourier series solution is derived on the osculating plane coordinate system which was proposed by Huang Liren (1990).The result shows that the method is of physical foundation as well as on geometry, vice versa our dynamical model of crustal vertical movement is favored by the self-consist of our model and Huang Liren's method.