The design allowableness is the key basis for the design and verification of composite structures. At present, the relevant domestic research is still in its infancy. The concept of design allowableness is introduced, the airworthiness requirements of design allowableness are explained, and a suitable test matrix and corresponding test method are given according to the design standards. Finally, the feasibility of this method is verified by the example of civil aircraft wall. Such method can be used to provide a reference to the further research of composite design allowableness.