(1) Customer loyalty refers to consumers' biased purchase behavior of products and brands of an enterprise when making purchase decisions. (2) Loyal customers are the most valuable customers of the enterprise. (3) A small increase in customer loyalty will lead to a substantial increase in profits. (4) Establishing customer loyalty is the most effective way to achieve sustained profit growth. Enterprises must change the concept of trading into the concept of establishing relations with consumers, from focusing only on the struggle and conquest of consumers to focusing on the loyalty and persistence of consumers.