Plastic packaging bags can be divided into three types: three-side seal, mid-bottom seal, three-dimensional middle seal and sheet material according to the bag making method. Plastic bags come in a wide variety of sizes and specifications. Therefore, designers and production staff often neglect the way of making bags. The result is that although the design is beautiful, the resulting packaging is unsatisfactory and even waste. Experience tells me that only on the basis of solving the types of commonly used packaging products, can we make full use of the design ideas, put an end to the design works that do not meet the bag making process, and design a practical and perfect packaging.