Tight oil reservoir is a kind of unconventional reservoir with poor permeability and well developed natural fractures. Stimulated reservoir volume（SRV）fracturing is an important means to effectively develop this kind of reservoirs. In order to study the influence of design parameters of fracture network on productivity，fractured tight oil reservoirs were divided into propped main fracture zones，fracture-network zones and unstimulated zones and the fracture-network zones were sub-divided into propped secondary fracture zone and un-propped secondary fracture zone based on the forming mechanism of fracture network. Dual pore system and single pore system were used to describe the seepage characteristics of the fracture-network zone and the unstimulated zone by taking non-Darcy seepage and stress sensitivity effect of the tight oil reservoir into consideration. Productivity model for tight oil reservoir after SRV fracturing was established，and the effects of SRV fracturing parameters on the productivity were analyzed. The research shows that the SRV fracturing can greatly improve the tight oil productivity. Tight oil reservoirs with higher productivity have larger stimulated reservoir volume and propped stimulated reservoir volume，intensive opened natural fractures，longer main fractures and higher primary and secondary fracture conductivity，but there is an optimal value.