The product design team adheres to the three core brand concepts in the shaping of PI, forming a complete product identification system from five aspects: modeling characteristics, color, core function characteristics of air outlets, extended application of signs and labeling methods. A complete feature planning of St. Mars's products has been carried out, forming a series of value transmission visual systems for consumers to understand and recognize and generate purchasing behavior. Among them, the characteristic color of the product is defined: good air only chooses green St. Pyle mint air green.