A member of the Cornaceae family, Cornus officinalis S. et Z. is a China native tree, which is deciduous and sub tall tree. It can grow to a height of 7m and up to 40m wide. Ecologically, this shrub grows well in hillside thickets. This research investigates quantitative morphological characteristics of flower among the C. officinalis in South Korea and then considers its relationship on the basis of raw data among the 10 selected populations. This study will give us invaluable information about growing condition, reasonable management and breeding by selection of C. officinalis in South Korea. The main results obtained from this study are summarized as follows; Suwon and Gunwi populations were larger in flower characteristics compared with other populations and Namwon population was smallest among populations. According to cluster analysis based on the flower morphological characteristics, the natural C. officinalis populations were classified into two groups such as the first group of Gurye, Suncheon, Jinju, Namwon, Hwasun population, the second group of Gunwi, Suwon, Chuncheon, Chungju, Icheon. Selection effects with 5% selection level was estimated at 130.3% in number of inflorescence per fructify lateral branch, 125.2% in number of flower per inflorescence and 121.9% in width of calyx.