The steel casing was left after the construction of cast-in place piles when constructing the deep-water bridge foundation. Then the pile actually formed a variable section pile which has a bigger section area at upper part and a less area at down part. To use the steel tube for force can improve the seismic performance of pile foundation,which has the advantages of high efficiency, simple and economical and has wide application prospect. Accorsing to the current situation of research and the application of steel tube concrete drilled pile, the difference between steel tube concrete pile and steel pipe concrete pile,the problem in the research of basic seismic performance of steel tube concrete pile, the paper pointed out some suggestion which can provide a reference for the further research of steel tube concrete pile.