Abstract: Currently，fracturing in tight gas reservoir generally exists a higher fracture pressure puzzle. In order to settle thisproblem, combined the characteristic of tight gas reservoir with the practical problems existing in fractured well in southwest Sichuan,the writers analyze the key factors influencing fracturing effect. In addition, by carrying out simulation experiment on large sizeand real tri-axial equipment and using the FLAC3D finite difference numerical modeling software, we also study the effect rules ofdifferent perforation modes, azimuths, densities, depths and sizes on fracture propagation and fracture pressure. On the base of thelaboratory experiment and simulation results, we optimized the perforation method of fracturing well in tight gas reservoir of southwestSichuan and obtained a optimization thinking that oriented perforating should be in the direction of maximum principal stress withmoderate hole density of 13~16 hole/m, large size and deep penetration. The field application result indicates that fracture pressurecould be effectively reduced and the productivity be increased. Therefore, for tight gas reservoir, oriented perforating optimum designis a powerful and feasible tool to accelerate the development of effective fracturing technology.