Abstract: For the structure reliability of the cylindrical composite shell rotating with a high speed, the strain equations were derived, then the axial, peripheral and shear stresses as well as the correspondenting main axial stresses were derived for every layer and their variations with the angle and the thickness of the small angle winding layer were obtained. The optimal designs of the structural parameter for the cylindrical composite shell were made under the condition that the object function was equal strengthen reliability which was 0.99 for every layer.