the inherent characteristics of a product refer to the inherent and unchangeable attributes and characteristics of the product. Among them, the function of the product refers to the actual use value and efficacy of the product, that is, the function and effect that the product can achieve. Quality refers to the performance and quality of products in use, including materials, processing technology and performance of products. Appearance refers to the external form and design of the product, including the appearance, color and pattern of the product. Safety means that the product will not cause harm to human body or environment during use, including the material, structure and use method of the product. Reliability refers to the stability and reliability of products in use, including product life, durability, maintenance and so on. These inherent characteristics are the basic attributes of products, which directly affect the use value and market competitiveness of products.