According to the nonlinear flow characteristics in tight oil reservoir，tree-like fractal theory was used to characterize the complex multi-scale explosive fractures net and a nonlinear flow model of explosive fracturing in hydraulic fractured layers was established. According to the different flow form of tight oil in the reformed formations，the flow area was divided into three zones，and then the coupling productivity formula of the three areas was derived. Analysis results of influencing factors of the productivity show that：the single-well productivity of explosive fracturing is 1.5 times that of conventional hydraulic fracturing. Larger fractal dimension of fracture space and tortuosity bring larger area percentage of explosive fractures and higher effective permeability of swept area of secondary fractures，and thus the productivity is higher. Productivity increases with the decreasing in bifurcation angle and the increasing in stimulated reservoir volume. So in the practical application，low energy release rate dynamite or multistage reaction rate dynamite should be chosen to reduce the bifurcation angle and magnify reservoir volume and productivity.