Fractured wells find widespread applications in the development process of shale gas reservoirs because of the enhancement of the per well production and the reduction of the cost. However, the reservoir is difficult to be completely opened in practice because of the large thickness of the shale gas reservoir. In this paper, according to the characteristics of desorption, diffusion and seepage, a seepage model of partial open fractured wells in shale gas reservoirs is established. The Laplace transform, the Fourier transform and the principle of Duhamel in combination with the Stehfest numerical inversion algorithm are used to obtain solutions based on the model. The pressure characteristic curves are obtained. The flowing phases are divided in the pressure characteristic curves. The influence of the relevant parameters on the pressure dynamic characteristics is analyzed. It is shown that there are seven main flow stages in the pressure characteristic curves for partial open fractured wells in shale gas reservoirs. The open degree has a main effect on the appearance of the spherical flow period and the position of the pressure derivative curve in the early time. The desorption coefficient has a primary effect on the depth of the dip in the pressure derivative curve. The dimensionless storativity ratio has a major effect on the depth and width of the dip in the pressure derivative curve. The dimensionless transmissivity ratio has a primary effect on the starting time of the desorption and the diffusion in shale reservoirs. The results can provide a theoretical support for the high-efficiency development of shale gas reservoirs using fractured wells.