Fluid inclusion research is one of the important aspects of geology study, and the volumes of individual phases in a inclusion are significant parameters. In early time, only the two-dimension area on the focus plane could be measured. A curve was proposed to estimate the volume of inclusion based on the two-dimension area, but the error is large. Bodnar suggested to calculate the volume of individual phase based on the diameter of the vaper bubble and the P-V-T-X properties of the fluid, and his method is supplemented in this paper for uncovered situation. A new method using figures obtained from experimental data is put forward here. Finally, an example is presented and methods mentioned above are compared.