In service sector, under increasingly fierce competition, most of hospitality industry pay attention and focus on improving service quality. They have intentions to provide good service and environment for customers dining. Past studies have proposed many theories on service quality. This study takes famous mid-level restaurant, Haidilao hot pot, in China for example. We use gourmet addiction as moderating variable, to explore its moderating role between service quality and customer complaints. Questionnaire survey was used to empirically test research framework. Path analysis and structural equation modeling are adopted to analyze the quantitative results. The results show that once the restaurant operators provide more better-quality services, more able to reduce the customer complaints level. For gourmands, consumers who more focus on food content will be more unsatisfied with the service, which increase the possibility of complain behavior. This study is expected to provide reference for the catering industry.