Abstract: For the first time, the unified compilation of Chinese Language textbook has set up the unit of writing exercise that is writing -oriented and reading -for -writing. Teachers should take the idea of dual -line organization unit structure as the guiding principle and implement it creatively on the basis of deep understanding of the textbook. The first unit of writing exercise at primary school level starts from unit 5, volume 1, grade 3. From this case, it is not difficult to find that teachers need to comprehensively apply various theories and measures, such as task-driven reading and writing, picture book instruction. They also need to have a comprehensive and systematic understanding of the unit theme and language elements of each year of primary school, as well as the sequence of their development. Moreover, teachers need to consider the six parts of the unit of writing exercise as a coherent whole, and design the teaching scheme, so as to achieve the comprehensive goal of integrating reading and writing as a whole.