There are various methods for the rainfall time distribution and numerous theoretical approaches have been proposed in many countries. The fact, however, is that only used model in each country are presented as official guidelines. In Korea, the Huff's method is generally used, but several problems have been proposed. Therefore, in this study, we developed the time distribution method using actual rainfall and verify its applicability. It is very reasonable to utilize the time distribution pattern which reflects the regional rainfall characteristics for designing the structures. In this study, a total of 172,851 storm events were extracted from 69 meteorological stations, and the hourly maximum rainfall over 30mm was separated to analyze the each event. Considering actual rainfall characteristic to drive the time distribution, we suggested the conditions and constraints to distribute the rainfall. Additionally, the constraint time distribution method can be applied to cases where peak runoff and runoff volume are crucial.