Abstract: Based on the Large Deflection Post-buckling Theory, wrinkling parameters of membranes were deduced in this paper, considering the influence of the tensile stress along the wrinkles. Then, the formulas were simplified according to the experimental results and used to analyze the buckling of a membrane under shear. The results are compared with the related documents and the numerical results of ABAQUS to verify the validity and rationality of the formulas.