This paper aims to explore whether metacognitive strategy training can effectively help college English learners to improve their metacognitive ability, so as to effectively improve their vocabulary level. The result shows that, after metacognitive strategy training, students' metacognitive consciousness is strengthened, and their vocabulary level is obviously higher than that of students without metacognitive strategy training.%本文旨在探讨元认知策略训练能否有效地帮助大学英语学习者提高元认知能力，从而有效提高他们的词汇水平。结果表明在接受了元认知策略训练后，学生元认知意识得到加强，词汇水平明显优于没有经过元认知策略训练的学生。
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