In this paper, the technical problems or considerations which could be arisen at the certification for composite small aircraft structures per FAR Part 23 have been reviewed and the actions expected applicants should take also have been explored. This paper focuses on the technical problems considered to be happening and describes the relation to the certification regulations and to the certification experiences. This paper is general information to composite certification activities, and presents some useful guidance materials and reference materials. The general information described in this paper could not be applied to any composite structures and to the secondary structures which not critical to flight safety.