The titanium (Ti) metal diaphragm tank is the key component of the power system of the aerospace vehicle, and its thickness is the key factor influencing its turning characteristics. In order to analyze the influence of the thickness on the reverse turning characteristics, the turning characteristics of the diaphragm with different thicknesses were analyzed by finite element simulation technique. The rules of turnover efficiency and transverse deformation were investigated. The optimum thickness of metal diaphragm is obtained by comparing and analyzing, which provides a theoretical basis for production practice.