Abstract: Based on considerable non-destructive identification data for composite components by autoclave process, sub-cluster statistics theory was applied in this paper to investigate the relationship between the structure form of composite components and manufacturing quality. A sub-cluster model about delamination area was set up. The process quality of composite components by autoclave process was evaluated on the basis of the sub-cluster parameters reflecting the tendency of delamination area. The results show that in the statistical range of composite components applied in aircrafts, the small delamination area is in a dominant position in the delamination area distribution of composite components. Moreover, the complex composite structures (such as I-shaped laminatess), the thinner (1~2 mm) laminates and the thicker (>5 mm) laminates increase the tendency of the large delamination area appearance and the dispersibility of delamination area, and thus lead to a worse manufacturing quality of composite components.