The purpose of this study was to investigate the influence of additional marketing mix on overall satisfaction of customers at family restaurants in Seoul and Kyongki-province. In this research frequency analysis, reliability analysis, factor analysis, multiple-regression analysis were employed to analyze the data. Additional marketing mix were divided into 3 factors. Employee(β=0.352, t(p)=7.221(0.000) had the most positive impact on overall satisfaction. And physical evidence(0.160, t(p)=3.271(0.001) and process(β=0.114, t(p)=2.338(0.020) influenced positively(+) in order. As a result, all factors of additional marketing mix influenced significantly overall satisfaction of customers. These additional marketing mix are regarded as effective marketing tactic to reduce intangibility of food-service business. Therefore restaurant company needs to manage additional marketing mix sufficiently to maintain of customers' satisfaction at family restaurants.