Objectives: This study aims to find out the association between Sasang and Eight Constitution by analyzing Sasang and Eight Constitution Diagnosis results. Methods: We analyzed Sasang and Eight Constitution Diagnosis results according to confidence, by reviewing medical records of 247 patients retrospectively whose Sasang and Eight constitutions were diagnosed by two independent specialists. We used chi-square test and Cramer Statistic to know association of two diagnosis results. Results and Conclusions: Taeumin was 49.8% in Jupita, Soeumin 65.2% in Mercuria, Soyangin 90.9% in Saturna, Taeumin was 54.2% in Jupita, Soeumin 83.4% in Mercuria, Soyangin 100% in Saturna in condition that Sasang and Eight Constitution diagnosis confidence is over Band 50 score. The higher diagnosis confidence is, also the higher association between Sasang and Eight Constitution is up to 0.414(Cramer Statistic). There is association between Sasang and Eight Constitution.