The vertical fracture is asymmetrical about the wellbore or the two wings of the fracture are not certainly in a line for the complex geo-stress in the possession of fracturing of oil gas reservoirs. In view of the low-permeability reservoir after fracturing developing the asymmetrical vertical fractures and non-coplanar fractures, based on the non-steady seepage theory, and using the potential function theory, superimposition principle and numerical analysis method, a dynamical prediction model for the vertical fracture in low-permeability oil reservoirs is deduced with the pressure drop superposition principle. The production decline laws are analyzed with practical cases. The result shows that the production of the vertical fracture well is initially high but soon followed by a sharp decline. Then, the production keeps in a relatively stable state and declines slowly in the middle and later. The fracture asymmetry factor has a little effect on the oil well productivity. The non-coplanar angles have a greater effect on the oil well productivity in the initial stage. The reservoir heterogeneity has a significant effect on the oil well productivity. The longer the fracture length and the bigger the flow conductivity, the higher the oil well production and the faster the decline rate will be. However, the increase amplitude will be getting smaller and smaller with the increasing fracture length and flow conductivity.