Based on the spherical radial flow model in fractal medium reservoirs,using Laplace transformation,this paper obtains dimensionless reservoir pressure and bottomhole pressure Laplace space solution by considering wellbore storage and skin factor of downhole conditions and various boundary conditions.And through in-depth analysis,this paper discovers and studies the similar structure and similar kernel function feature.The research has not only brought great convenience for preparation of well testing analysis software but also the new development of the theory of percolation mechanics.