1, 3-to 5-year-old children are in the stage of perception and discovery of the elements of the world, focusing on concrete thinking and teaching children to build different main structures with Lego bricks. Children aged 2.5 ~ 6 have a deeper understanding of the world and have a certain foundation in language, hands-on and innovation. Using Lego building block equipment, children can be taught to construct devices and realistic models with more complex functions and structures and full of innovative theme activities, and their interest in exploring science can be promoted. Children aged 3.6 ~ 8 years have gradually deepened their understanding of the world, and have a certain foundation in language, hands-on and innovative ability, as well as a certain knowledge of nature, science and society. Children can be taught to construct more complex and diverse devices and realistic models in terms of function and structure, and innovative theme activities can not only further improve children's practical ability and imagination.