The continental tight oil reservoirs in China have poor physical properties and strong heterogeneity. Large-scale stimulated reservoir volume（SRV）fracturing often induces complex fractured networks，and the influence of secondary fractures on productivity cannot be ignored. An ellipsoid fracture network including main fractures and secondry fractures was designed by local grid refinement，and the production dynamic of fractured horizontal wells in Xinjiang X Oilfield was simulated by numerical simulation. The influencing factors of the productivity of the fractured horizontal wells were analyzed.The results show that the productivity of horizontal well increases with the increase of length of the horizontal section，fracturing scale，SRV，fracture network complexity and fracture conductivity，but the trend of increasing gradually decreases.There is an optimal range for each parameter. The orthogonal experiment was also used to sort the influencing degree of each engineering parameter on the productivity，and it is shown that the SRV has the greatest influence on the productivity of the fractured horizontal well in tight oil reservoirs，which is followed by fracture scale，fracture network complexity，horizontal well length and fracture conductivity.