Human design is an inevitable trend and development in product design. To achieve the goal of human design, master's physiology, psychology, design data is key data that must be followed. Among them, the body size of the designer to determine is an important basis for product dimensions. The article first analyzes the characteristics of the body size, application method of body size and application procedures, finally, small kitchen appliances storage cabinets design as an example, analyzing the appliances the body size in the product design.