The customer is the enterprise's most important target for resources. Therefore, long-term relations between the maintenance enterprise and its customers in order to enhance the degree of customer satisfaction and loyally can cause the enterprise to maintain profitability. However, as research has pointed out, customer satisfaction and customer loyally are connected. Promoting customer loyalty is helpful to the enterprise to create greater satisfaction and profits, and to help the company's growth Promoting customer satisfaction is important, but customer loyally is more noticeable and quantifiable. In past research, studies were made of relationships between customer satisfaction and loyalty among certain companies. Therefore, this research simultaneously studies an industry's two biggest companies' (CPC and FPCC customers-investigating customer degrees of satisfaction and customer loyalty, and discussing the relationship between the two. The success of each company's promotional technique in gaining customer satisfaction was concluded. This research interviewed 1,000 Kaohsiung area customers of these two companies. 835 valid responses were kept, using SPSS statistics software to make a Factor Analysis, Re liability Analysis, and so on. Also, a "Regression" Analysis of different consumers connecting "service quality" and "degree of satisfaction" to a "level of loyalty" led to a permanent forecasting model. The research led to conclusions which were suggested to the two companies. The conclusions were: 1. In the market for delivery of consumer oil products, customer degree of satisfaction directly affects customer loyalty. 2. In measuring the degree of customer satisfaction, the service attached to the product affects customer loyally the greatest.