Professor Zoltán D?rnyei is an influential researcher of L2 learning motivation. Since 1990 s, he put forward several important L2 learning motivational theories and made special contribution to this field. This paper introduces his four L2 learning motivational theories: 1)Three-level framework of L2 motivation; 2) Process model of L2 motivation; 3)The L2 Motivational Self System; 4) Directed Motivational Currents(DMC).
