The invention discloses a user interest modeling method based on user browsing behavior, comprising the steps of constructing a user interest model in an apparent mode and updating the user interest model in a concealed mode. The step of constructing the user interest model in the apparent mode is a process of primarily establishing and initializing the user interest model through user registration, and the step of updating the user interest model in the concealed mode is realized by analyzing and researching the user access preference according to the condition that users accesses Web pages under the condition of no need of user participation. By using the method, new interests of users can be automatically discovered, and feature items with low interestingness in the user interest model can be eliminated. Therefore, one the one hand, the interest change of users can be better monitored, and on the other hand, the unlimited increase of the user interest model can be controlled in time, and the stability of the interest model is improved.