In modern society, children's rights are important. Many children in elementary schools have pocket money and can choose to buy the snacks they like. Children choose snacks are more intuitive than adults. Therefore, many packages design are trying to get children's attention and attract them to buy. How could be the product become more attractive to children's attention? This study uses animal biscuits as an example. By studying the biscuits packaging design in the market, the current elementary school students' attention to the color and graphic parts of the packaging design is calculated, and the relationship between packaging design and children's developmental psychology, in order to enhance the attention of the packaging, children's buying intentions are aroused.