In order to make the calculation of metaltometal contact(MMC)type flange joint more accurate,CEN proposed prCEN/TS15913 to fit the calculation of MMC type flange in 2006.The detail of prCEN/TS15913 method was introduced,such as the mechanical model,calculation process and gasket parameters.A calculation example based on prCEN/TS15913 was given,which provides a reference for MMC type flange calculation.