Double-sealing metal O-ring is a commonly used sealing structure for reactor pressure vessels.In order to study the calculation formula of required minimum pressing force of double-sealing metal O-ring,the ANSYS finite element software was used to establish a two-dimensional axisymmetric model of metal O-ring,and the values of the pressing force for single channel seal and double seal at the same compression rate were obtained.The correction formula for calculating the pressing force of double seal was established,and the correction coefficient of the double seal was obtained by comparing the finite element values and theoretical values of the pressing force of the double seal.The results show that the diameter of the center circle of seal ring is constant,and under the same compression rate,the pressing force of the single seal ring is smaller than that of the first seal ring of double seal.When the correction coefficient of the first seal is 1.021,the correction coefficient of the secondary seal is 1.028,the minimum pressing force calculated by the correction formula is consistent with the calculated value of the finite element.