Abstract: Tight gas reservoirs are characterized by low permeability, narrow pore throats and extremely poor flowing conditions. Based on the influence of stress sensitivity on reservoir permeability, this paper establishes a new mathematical flow model for horizontal well fracturing in tight gas reservoirs and then obtains semi-analytical solutions of dimensionless pressure considering wellbore storage effect through Laplace transform. Based on the verification of the validity of the model, the productivity vs. time curves are plotted for staged fracturing in horizontal wells, the factors influencing productivity are analyzed and orthogonal experiment is designed to determine the main controlling factors. The results show that when the fracture half-length is 140 m and the density of fractures is 6 per 1000 m, the optimum production can be obtained by increasing the permeability of the stimulated area. The conclusion is of guiding significance for the design of horizontal well fracturing in tight gas reservoirs