In virtue reliabilism,intellectual virtues mainly refer to cognitive abilities such as intuition,perception,in-trospection,and memory.Compared to intellectual virtues as cognitive character traits in virtue responsibilism,intel-lectual virtues as cognitive abilities are more challenging to grasp.To comprehensively understand Sosa's concept of"intellectual virtue",we need to analyze it from different dimensions such as its background,definition,function,purpose,and value.Sosa's purpose in proposing the concept of"intellectual virtue"is to solve the justification problem of belief.The"supervenience"of justification is the key for intellectual virtues to act as a reliable source,and the in-trinsic reliability of intellectual virtues is the theoretical foundation of virtue reliabilism.The reliability of intellectual virtues is inseparable from the environment,which is the premise for Sosa's solution to the New Evil Demon Problem and his proposal of the concept of"aptness".Virtue perspectivism emphasizes the coordination between the cognitive agent and the environment,achieving justification and aptness of beliefs through intellectual virtues.Sosa's theory of"intellectual virtue"not only provides new approaches for resolving the traditional epistemological dilemmas but also deepens our understanding of the cognitive processes.