The reservoir types and its boundary conditions are complicated in our country. Most of them have gas cap, bottom water, edge water or impermeable fault. Double porosity reservoir and triple porosity reservoir are common in China. It is very difficult to exploit those reservoirs. Therefore it is very important to research the flow in porous medial of those reservoirs. Source and Green's function is an effective mathematic tool to resolve the flow in porous medial in oil and gas reservoir. In this article, b...