Because of the fuel-rich propellant's high heat value and combustion temperature,the common stainless steel crucible and oxygen bomb's parts are always burned in the combustion heat testing process.In order to realize the proper testing of combustion heat,some fireproof materials' characteristics and their application in the combustion heat testing of fuel-rich propellant were studied.Those fireproof materials include acid washing asbestos,C/C compound materials,Al₂O₃ chinaware and tungsten crucible.The results show that the C/C compound materials have heat reaction while the acid washing asbestos,Al₂O₃ chinaware,and tungsten do not have heat reaction under high temperature and oxygen atmosphere.The application of three kinds of fireproof materials in testing the fuel-rich propellant's combustion heat show:Al₂O₃ chinaware can be used for only one time;spreading the acid washing asbestos in the tungsten crucible can improve the experimental value which is 94% theoretical value.