Due to global warming and abnormal temperature, localized torrential rains are increasing worldwide in recent years. More concerning in Korea, where most of the land is composed of mountainous areas, flood damage such as landslides has become increasingly more dangerous. Accordingly, the importance of erosion control dams, one of the structures for preventing flood damage in mountainous terrain, is mentioned, but most dams design need alternatives due to material limitations, which are usually composed of concrete. Therefore, to reduce the cost of rapid recovery and maintenance based on the problems of the existing erosion control dam consisting of concrete; this study focused on an improved open-type erosion control dam. For this purpose, an analytical study using a commercial finite element analysis program was conducted to implement the dam shape and drift prevention structure, and to calculate the external load under extreme environmental conditions to comprehensively confirm the safety of the target structure.