From a case study of Lining brand design research, it presents a user tribe classification method and practice based on user self-expression. Researchers step into every user's daily life and gather a large amount of user's opinions and information of his personal belongings, life experiences and auto gnosis. It provides an analysis model with two dimensions of "Self-oriented/Social-involvement" and "Ideal-motivated/Task-based". It is concluded that young people in the second and third-tier cities could be classified into four major categories, a total of ten users segmentation types. The method based on user self-expression that gives the initiativeto user is extremely efficient in the user tribe classification research.