目前国际上考虑高温下焊接结构特点的评定规范尚不多见，我国在此领域亦还属空白。为此，本文在评述国际上高温结构的评定规范的基础上，着重介绍了Ｒ５ 卷６ 对异种焊接头的评定方法，包括评定程序的步骤、参数的选取和实例验证等。 At present, the international assessment criteria for welding structure characteristics under high temperature are still rare, and our country is still blank in this field. Therefore, on the basis of reviewing the evaluation rules of high-temperature structure in the world, this paper focuses on the method of evaluating the different types of welding head of R5 volume 6, including the steps of procedure, parameter selection and instance verification.