This paper presents a three-dimension (3D) fluid potential method based on Hubbert fluid potential model and 3D pore pressure. First, combing 3D interval velocity data which is inverted through log-constrained seismic inversion and well logging data, it can obtain the 3D pore pressure based on spatial interpolation method and the single point hypothesis. Then, we calculate the 3D fluid potential using the mutual correspondence between the fluid potential and pore pressure. Finally, we calculate 3D fluid potential of Boxing sag as an example to illustrate the process of this method and analyze its characteristic and predict the favorable exploration area.Compared with fluid potential contour map, this method has high accuracy, good continuity.