In view of the asymmetrical vertical fracture in the low permeability reservoir after fracturing development, and based on the steady seepage theory, and by means of the conformal transformation method, a prediction model for the finite-conductivity asymmetrical vertical fracture wells is established in the low-permeability gas reservoirs, and the various factors on the gas well productivity are analyzed. The result shows that, under the same bottom-hole pressure, the fracture asymmetry factor has little effect on the productivity of the gas well with asymmetrical vertical fracture. When the fracture conductivity capacity is small, there is great difference in the productivity of the fracture gas well with respect to fracture length or fracture asymmetry factor. And, when the fracture conductivity capacity is high, there is little difference in productivity with respect to variable fracture length or fracture asymmetry factor in gas well. The longer the fracture length, the less the fracture asymmetrical factor, and the greater influence on the fractured gas well productivity.