Cold-formed thin-walled steel has large post-buckling strength under compression,effective width method and direct strength method are used to analyze at present.In this paper,with a comparison between the numerical example and experimental results,the different values of ultimate bearing capacity between the two methods and experimental results are found,effective width method given by the technical code of cold-formed thin-walled steel structure is conservative and the results of direct strength method are relatively close to the experimental results,in engineering direct strength method can be taken into account.