Abstract: As there are some insufficiencies in the current second-order analysis methods adopted universally, displacement interpolating equations for tension and compression members considering second order effect are deduced respectively. By a series expansion, the pre-buckling member calculation model considering beam-column effect is deduced, which can be applied to both tension and compression members. The criterion of member buckling and the post-buckling member calculation model are introduced, and the second-order calculation method for a single layer latticed shell considering member buckling is established. Numerical analysis results, which incarnate the influence to the displacement and bearing capacity of the structure led by second-order effect and member buckling, show that it is a method of higher effectiveness and accurateness. The structural bearing capacity will be overrated if the member buckling is neglected, and the accurate structural responses cannot be obtained if the second order effect is neglected. Thusly the member buckling should be considered and the second-order calculation method should be used to make an accurate analysis of single layer latticed shells.