The purpose of this study was to determine the role of the ideal aspects of ownership structure and capital structure in determining the uncertainty model of operational of Walmart. This type of research is an explanatory survey using qualitative and quantitative approaches. The qualitative method is carried out by descriptive analysis by conducting a field survey using a questionnaire designed in such a way. Respondents of this study were the 78 managers of the community minimart in Medan City, North Sumatera, Indonesia who were selected by purposive sampling method. Meanwhile, the quantitative method was carried out using SEM PLS analysis by analyzing the indicators of aspects of ownership structure, capital structure and dimensions of operational success. The results show that the capital structure variable had a significant effect on Walmart's operational success. Meanwhile, the ownership structure variable had no significant effect on Walmart's operational success. The novelty that is produced from this research is that the success of community self-service is determined by the capital structure. Capital is an obstacle faced by community supermarkets because with limited capital it is difficult for community supermarkets to expand their business.