Abstract: The annular metal diaphragm cryogenic tank can meet special needs,such as make full use of the outer space.The starting-rolling-over position,rolling-over pressure and center-of-mass misregistration of the annular metal dia-phragm during the rolling process are all affected by its structure,especially by the thickness distribution of the diaphragm.In this paper,non-linear finite element models of annular metal diaphragms with different thicknesses were established.Through the simulation of the diaphragm rolling process,the influence of different thickness on the rolling characteristics was studied,which provides a reference for the design of similar metal diaphragms.In the end,a rolled-over test was car-ried out for the metal diaphragm with variable thickness.The rolled-over pressure difference and lateral swing of the dia-phragm at different positions were measured and compared with the design results.The difference between the actual mea-surement results and the design results and the reasons were analyzed.