The invention belongs to the user behavior analysis technology field and especially relates to a user behavior classification method and a system thereof. The user behavior classification method comprises the following steps of step a, according to user behavior data, constructing a user-behavior multidimensional description table, and according to the user-behavior multidimensional description table, carrying out classification annotation on a user; step b, according to the multidimensional description table and user classification, constructing a classification model, and according to the classification model, constructing a user behavior knowledge base and a rule base; and step c, collecting new user data, and through the user behavior knowledge base and the rule base, carrying out automatic classification on a new user. In the invention, through constructing a travel behavior knowledge base and the rule base of the user, based on the travel behavior knowledge base and the rule base, the new user can be automatically classified and rapid construction of a new user portrait is realized; and aiming at a distinctive user behavior type, a correlation product is recommended and effective and customized recommending of the product can be realized so that advertisement incomes of an enterprise are increased.