Play is the main activity for preschool children and holds an important position in the early childhood education program. Play activities include many games, among which building games are very popular with preschoolers. To create structures or products, children need to have construction assembly skills, which is one of the key factors determining the effectiveness of building play. For children aged 3-4, their construction assembly skills are still weak, they do not yet know how to take care of their products and often dismantle them after building. Therefore, preschool teachers need to implement active measures to develop construction assembly skills for 3-4-year-old children in preschool.