The present invention provides a method for providing a knowledge-based personal intelligent health consultation, to which a medical knowledge base is constructed and utilized, and the correlations between the diseases and symptoms encompassed therein are statically and dynamically evaluated. The present invention also provides a system for providing a knowledge-based personal intelligent health consultation, in which an inference engine is configured to intelligently assess certainty values of diseases/symptoms presented in the medical knowledge base while interactively and adaptively adjust the certainty values of symptoms and possible diseases based on the instant selection of a user. Through a series of interactions, an accurate, fast, and personalized health consultation can be obtained since the user is guided to provide the right answers to the right questions proposed by the system; thus, significantly promotes the users' willingness to seek a health consultation and increases the health condition of the general public.