Math lesson plans involve contents 1) teaching objectives, knowledge and skills, processes and methods, emotional attitudes and values 2) teaching difficulties 3) teaching process (specific links can be set according to the contents) introduction, new knowledge exploration, in-depth exploration, consolidation and improvement, and homework summary 4) blackboard writing design 5) teaching reflection example The teaching process link in the lesson plan of "the surface area of a cylinder" in primary school mathematics: a new lesson. For example: 1) teacher: in the previous study, we already knew the cylinder, and we know that many objects in life are cylinders in shape. Look at this cylindrical object. Its production requires certain materials (showing a tea box). Please think about it. If you want to "make such a tea box", what do you actually ask for in the jar? (Explain while demonstrating) 2) Generation principle: Introduce the lateral area, bottom area and surface area of the cylinder. Teacher-student activity: The requirement of "materials needed for making tea boxes" is actually to find the lateral area and two bottom areas of the cylinder (during demonstration). We call the area of the side surface of the cylinder lateral area, and the area of the bottom surface of the cylinder lateral area plus the areas of the two bottom surfaces of the cylinder.