Abstract: This study takes the initiative to test the association between CET4 and L2 motivational self system via a questionnaire survey. Results of this research are as the following: there is a significant difference of Ideal L2 Self and L2 Learning Experience between the students with different CET4 achievement, but not significant difference of Ought-to L2 self; CET4 achievement has a significant positive association with Ideal L2 Self and L2 Learning Experience, but a negative, not significant, association with Ought-to L2 self; Ideal L2 Self and L2 Learning Experience have a marked regression relationship between the two factors and CET4, and Ought-to L2 self has no regression relationship with CET4. Hence, students should hold a correct attitude toward L2 motivational self system and improve L2 language ability.