Abstract: To solve the problem of well test interpretation of fracture asymmetry during fracturing in the complicated strata, based on the basic theory of point source function, a mathematics model for well test interpretation of finite conductivity vertical fractures was established, then a well test interpretation model of the unconventional fracture during multi-staged fracturing in horizontal wells was obtained by using pressure drop superposition principle, and the semi-analytical solution of the model was obtained with integral transformation. The fractures were discredited numerically, and combined with the semi?analytical solution and Duhamel principle, bottom hole pressure and pressure derivative curves considering the wellbore storage and skin effects were mapped on the basis of Stehfest numerical inversion. The results showed that the model included wellbore storage stage, bilinear flow stage, early linear flow stage, first radial flow stage, second linear flow stage, transitional flow stage and systematic radial flow stage; asymmetric factor mainly had an influence on time length in the bilinear flow stage; fracture perveance mainly affected the characteristics of downhole pressure and pressure derivative curves in bilinear flow stage and early linear flow stage, and the greater the flow conductivity was, the more unobvious the characteristic of downhole pressure derivative curves in the bilinear flow stage would be