日语写作是日语学习者比较艰难的训练过程。"拓展句子"不啻是词汇的简单迭加，还是在语法、修辞训练过程中对写作技巧和规律的把握。这要求通过把握拓展的界定、训练及在教学中应注意的问题，实现"为迁移而教"的目的，推动学生习惯于日语思维和日语文章的创作，进而完善日语写作的学科建设。，To Japanese learners, Japanese writing is a difficult training process. "Expanding Sentence" is not only a simple puttin g words together, but also the grasp of writing skills and rules through the tra ining of grammar and rhetoric. The expanding needs to be defined and trained and the problems which should be paid attention to in the teaching needs to be gras p ed. By the above, we can achieve the aim of "teaching for transfer", promote s t udents' thinking and writing in Japanese and perfect the subjects building of Ja panese writing.