Abstract:Within the theoretical framework of L2 Motivational Self System and by questionnaires and SEM, this study examined the mediating effects of motivated behavior on L2 Self and English reading and writing skills. The results show that Ideal L2 Self exerted a significant effect on reading skills, and motivated behavior partially mediated the effect of Ideal L2 Self on reading skills; L2 Learning Experience had a significant effect on writing skills, and motivated behavior partially mediated the effect of L2 Learning Experience on writing skills; Oughtto L2 Self exerted no significant effect on reading and writing skills, and thus no mediating effect existed. These results may contribute to the teaching and learning of English reading and writing skills.