Purpose: The purpose of this study is to investigate how the unique partnership of Dancesport develops, what are its key factors, and to specify the concepts derived from the process of development. Methods: To collect data, in-depth interviews were conducted with 6 pairs of national competition champions who have more than 5 years of partnership experience and who are registered in the Korean Federation of Dancesport. The data collected from the interviews were analyzed by Triangulation in open coding, axis coding, and selection coding according to Grounded Theory methodology. Results: With coding, 66 concepts, 17 subcategories and 6 upper categories were found. These were categorized and structured. When analyzing the results, first, the participants met their partners and ‘shared goal consciousness’ each other. Second, by accumulating various positive experiences, they built four types of strong ‘trust’. Third, ‘behavior of trust maintenance’ was influenced by various stimulations, both positively and negatively. Finally, a ‘harmonization’ of partnerships developed. Conclusion: Several of the concepts investigated were found to exist multidimensionally as the process of partnership developed over time. We suggest that a theoretical verification for the process of developing partnership is needed.