Abstract: This paper proposed the vital problems in structure design, manufacturing and maintenance of aircraft-used composite materials according to the summarized cases of aircraft maintenance home and aboard. These problems covered the design of sandwich structure under the impact load, handle of the contact points between sandwich panel and air duct, treatment of front edges of composite parts, design of fastener hole, applications of blind fasteners and aramid components and many more. It was concluded that adhesives were recommended to use in the thin composite parts, and however co-curing process should be adopted to improve the rigidity of composite parts. Furthermore, the relative maintenance problems should be paid attention to for the co-cured parts.