Abstract: After the consolidation of the composite ring in tension winding, the mandrel is drawn out, and then a hollow ring is formed. The process is called unload of inner hole. Based on the analyses of a pressfit of multi-ring and tension winding of a composite flywheel, the simplified analyses of multi-ring pressfit of the composite flywheel is advanced, which adopts the influence of winding tension and unload of composite ring. Then the formula of stress and deformation is proposed. The result showed that the fields of stress and deformation changed evidently when the composite ring unloaded from the mandrel. The method of combination of the two ways can availably increase the radial compressive stress and smooth the hoop stress. The real interference caused by the unload of the rings had increased much relative to the initial appointed interference, which should be paid enough attention to.