The purpose of this study was to provide fundamental information for differentiated marketing strategies and effective administration in relation to youth sport clubs by finding out factors influencing the relationship marketing for youth sport club. Five hundred parents in ten youth sport clubs located in the Seoul metropolitan area joined in this study, and four hundred eighty four were collected and utilized. For data analysis, SPSS Ver.12.0 was used for frequency analysis, factor analysis, reliability, correlation relation analysis and multiple regression analysis. The results are as follows. First, it was revealed that the factors of professionalism, marketing usability, customer oriented, and imformativeness, influence customers` trust within the statistically significant level. Secondly, the factors of marketing usability, imfornativeness, professionalism and customer oriented affect customers` satisfaction within the statistically significant level. Third, the factors of marketing usability, professionalism, customer oriented have relationships customers` royalty in the significance level