Abstract: To solve the problems of isolation agent addition in blocking-hot rolling process for layered metal composites,isolation membrane with high heat resistance used for hot rolling laminated metal composite was prepared using inorganic substance with high temperature resistant as raw material which was modified by polymer.The microstructure,mechanical properties and thermal decomposition characteristics of the isolation membrane were analyzed by scanning electron microscopy（SEM）,the material universal testing machine and thermogravimetric analyzer,respectively.And the actual rolling effects of the membrane were also verified.The results show that the inorganic substance is embedded and dispersed in the framework of organic polymer which can be fully decomposed in the hot rolling process of the composite slab.And the inorganic substance remains in the surface of the metal,isolating the bonding of the unbonded surface of the cladding metal.The isolation membrane with a better toughness can be obtained at 55%～75% of the inorganic substance.The particle size of the inorganic substance has an effect on the surface quality of the laminated metal,and it is optimized at less than E μm.