From the perspectives of the customers, this study uses critical incident technique to explore the sources of customer's satisfaction and dissatisfaction in the hotel service encounters. The results are as follows. In the interpersonal interactions, the categories of Bitner, Booms, and Tetreault's study (1990) are still suitable. However, in the nonhuman elements, physical surroundings and self-service technologies are important factors in affecting the customer's satisfaction. This study highlights related management implications for the managers of hotels to improve service quality.