Abstract: It is indicated in the empirically investigation, under the framwork of L2 Motivation Self System Theory by Zaltan Dornyei, on the possible self and learning experience conditions as well as the influence on the learning motivation and diligence degree involved in this system for vocational college students that the theory is of practical significance to Vocational English teaching, and the possible self and learning experience has remarkably the positive correlation to the learning motivation and diligence degree but the influence is different to some extent. And the possbile self somehow stimulates the motivation and makes less influence on the diligence degree, but the influence of learning experience is more striking on the motivation and diligence degree.