设计“综合与实践”课程的本意是“基于问题、注重综合”。本文以课例“怎样让书包变轻”为载体,探讨小学数学“综合与实践”课的设计方法和实施策略,提出在课程设计与教学过程中应特别关注三个方面:活动前,选择问题要“好”;活动中,研究过程要“实”;活动后,反思成果要“深”。 Design, “Integrated and Practical,” the original intention of the course is “based on the problem, pay attention to comprehensive ”. This article, based on the case study “How to make the bag lighter” as the carrier, discusses the design method and implementation strategy of the elementary mathematics “synthesis and practice ” course, and puts forward that three aspects should be paid special attention in the process of curriculum design and teaching: In the past, the question of choice should be “good”; in the activity, the research process should be “real”; after the activity, the result of reflection should be “deep.”