The water-gas dispersion system can effectively change flow channels of formation oil，inhibit the channeling of displacement fluid，expand the swept volume of the water-gas dispersion system in reservoirs，and enhance the producing effect of the remaining oil. Since it is difficult to directly observe the flow of the water-gas dispersion system in porous media，there are few studies on the transport mechanism of the water-gas dispersion system in porous media. The author proposes a new simulation method to study the transport of the water-gas dispersion system in porous media. The level set method and the gas-liquid two-phase flow are adopted，and the coupled numerical calculation software COMSOL Multiphysics is employed for research. The mechanisms of the Jamin effect，coalescence，and division of the water-gas dispersion system in the pore throat are simulated and studied. The influencing factors of dynamic pressures during the transport of the water-gas dispersion system are discussed，and the morphological changes of the dispersed-phase bubble during the coalescence process are analyzed. The dynamic characteristics of the water-gas dispersion system during division in the pore throat are studied. The result shows that numerical simulation can intuitively reflect the transport mechanism of the water-gas dispersion system in the porous media.