Since Guangfa Bank 1995 launched the first real credit card in China, other commercial banks have successively launched similar products, and foreign-funded institutions have also tested the mainland card issuance market in various ways. China's credit card market has entered the Warring States Period. In order to seize the credit card market and compete for customers, banks continue to increase marketing efforts, and various marketing methods emerge one after another, and the competition in credit card business is becoming increasingly fierce. In the increasingly severe market competition situation, how to consolidate the market, win customers and expand market share by continuously improving customer service level is a big problem faced by every card-issuing bank. This paper focuses on the importance of credit card customer service, the relationship between customer service and marketing, and how to do credit card customer service well. First, the importance of credit card customer service As a service-oriented financial enterprise, providing customers with satisfactory service is the embodiment of its existence value and an important way for it to obtain profits. The functions of credit card products are homogeneous, and the credit cards of issuing banks are completely competitive products.