Three-year-old children are in a period of rapid development of self-awareness and cognitive ability. They need to discover the world around them through games and exploration, so playing is their main activity. However, this does not mean that they can't do some simple thinking training. For example, through interactive games, let them learn basic concepts such as classification, counting and comparing sizes, as well as basic reasoning and problem solving. These exercises can be carried out through toys, books and parent-child activities. In short, three-year-old children need to play mainly, but they can also get some basic thinking training in the game.