Abstract: Deep shale reservoirs are characterized by high temperature, high in-situ stress and large horizontal stress difference. After the implementation of conventional staged fracturing, the stimulated reservoir volume is usually relatively small, the level of fracture complexity and the test yield of gas wells are low. It is concluded that high pump injection pressure and low flow rate during the staged fracturing are the main reasons leading to insufficient reservoir stimulation in deep shale gas wells. To improve the adaptability of the technology and the effect of reservoir stimulation, the study on fracturing optimization for deep shale gas is carried out. The simulation results show that the intensive staged fracturing is good for increasing stress interference between clusters and improving both fracture complexity and stimulated reservoir volume. The conventional staged fracturing technology was initially adopted in the Well Zi-2, and then a field test for intensive staged fracturing was carried out. The test results show that the fracture complexity and stimulated reservoir volume are significantly improved, indicating the applicability of the intensive staged fracturing technology in the deep shale gas wells in the study area