Abstract: Elaborated here in the paper are the essential difference between the metallurgically-clad steel pipe and the mechanically-lined steel pipe, and the development situations thereof.Also discussed are the problems as staying with application of the CRA clad pipe process in the development.Further proposed are the method for optimization of weld quality of the clad pipe or the lined pipe, and the methods for assuring of the manufacture and application quality of the lined steel pipe.Comparatively analyzed are differences between applicable foreign and domestic standards for heat treatment of the clad steel plate(pipe).And finally discussed are the method and standard for inspection of the bonding quality of the clad steel plate, and the basis for determining material of the clad steel pipe.