Abstract: The capacity of chunk-output is highly correlated with communicative competence in oral language. Based on dual coding theory (DCT) and multimedia learning theory, this article investigated the impact of DCT of multimedia on second oral-language teaching. A sample of 118 sophomores participated in this research under different learning environments. One-way ANOVA analysis of data indicated that the levels of EFL learners' oral proficiency improved, the performance of sophomores in experimental group was doing better than the control group. There were significant differences in four chunk-output indexes, namely number, frequency, diversity and length of chunks; however, the four indexes in experimental group significantly increased, and the increase of last two indexes of the control group is not obvious. The findings provide insights into how to apply DCT of multimedia to oral language teaching so as to promote chunk-output of learners and develop their level of oral proficiency.

Key words: subheadings, genre analysis, Chinese MA thesis introductions