The preschool teacher is the most influential person on preschool students' eating habits. Therefore, teachers should have enough knowledge to build up children’s good eating habits and find solutions to improve children’s unhealthy eating habits. The major purpose of this study is to explore the effects of visual stimulation on the ill-balanced feeding behavior of preschool students. The researchers adopted the qualitative method of case study to the objects having significant symptoms of ill-balanced feeding at a public mixed-aged kindergarten and applied methods of interventional experiments, interviews, and observation to collect data for compressing whether the visual changes and stimulations of food could improve children’s ill-balanced feeding behavior. The study results show that visual stimulation by changing food’s look definitely improves children’s eating rate and quantity and recommend more variations in the food sharp to improve children’s eating habits.