On the basis of cooperative leaning theory, this thesis makes an empirical study on the ap-plication and effect of writing strategy by English majors of vocational colleges. Major findings are as follows:(1) The frequent-used strategy in the experimental class and the controlled classes is editing strategy, while the less frequent-used strategy is drafting strategy. The experimental class uses the planning and editing strategy much more than the controlled class. As the drafting and revising strategy, the frequency used by the two classes is almost the same. (2) After the experiment, the writing proficiency of students in experi-mental class is better than the controlled class. (3) Compared with the controlled class, the experimental class has improved more in tense of verbs, subject-verb agreement and the numbers of nouns; for the use of preposition and articles, there is no obvious difference between the two classes. This study has enriched the research on the writing strategy and the cooperative learning. Besides, it has proved that cooperative learning can improve students’ writing proficiency and English learners should attach great importance to it.%以合作学习理论为基础，通过问卷调查和独立样本T检验对高职高专英语专业学生写作策略使用及其效果进行实证研究。结果表明：（1）实验班和对照班使用最多的是润色策略，最少的是初稿策略。实验班使用写前策略和润色策略比对照班要多，两班在初稿策略和修改策略使用上大致相同。（2）实验结束后，实验班的英语写作平均成绩高于对照班。（3）实验班在时态、主谓一致、名词单复数等方面的得分高于对照班，两班在介词和冠词的使用方面没有明显差异。该研究丰富了人们对写作策略和合作学习的认识，证实了合作学习模式对提高学生写作水平有促进作用，应该得到英语学习者的高度重视。
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