Abstract: Faults play a dual role in hydrocarbon migration and accumulation, which provides migration paths or close hydrocarbon, so that the evaluation of fault sealing has a great significance in oil and gas exploration and development. There are many ways to study fault sealing at present, and they can be summarized as lithology, mechanics, fluid nature, fluid inclusions and comprehensive evaluation. These different research methods and some study cases from experts are selected to elaborate the principles, characteristics and application of various types of research methods in detail, in order to evaluate fault sealing reasonably.