Accurately obtaining the unsteady flow bottom pressure of fracturing vertical wells helps to monitor and predict oil and gas well production in oil and gas field development.From the most basic seepage control equation, considering the turbulence of the fracture and the matrix, a mathematical model of the instantaneous pressure of the unsteady flow in the dual-medium reservoir is established.Through the mathematical transformation method and numerical inversion method, the real-domain numerical solution of the bottom hole flow pressure is obtained,and the sensitivity factor analysis of the bottom hole flow pressure is carried out.The analysis results show that the pressure curve can be divided into four stages,namely early linear flow,medium radial flow,late spherical flowand boundary control flow.The fracture half-length and the permeability ratio mainly affect the early linear flow,and the elastic storage ratio (matrix) and the exchange coefficient mainly affect the medium-term radial flow,and the skin coefficient mainly affects the late spherical flow.The dynamic analysis on bottom pressure provides technical support for rational production allocation of oil well.