The study on the satisfaction of customers when using cards at commercial banks in TraVinh province was conducted by surveying 350 customers using ATM cards at 12 commercial banks in TraVinh province, Viet nam by the use of the multivariate regression method, the research has found that there are a number of factors affecting the satisfaction of customers using ATM cards: Tangible means, sympathy, ATM network, service efficiency and reliability. Of which, tangible means, sympathy, ATM network and card service fees have the strongest impact on customer satisfaction.