Recently, the floods, droughts, and many disasters have occurred due to the global warming. The river flooding, flooded homes and landslides are also occurred throughout the Korea because of the heavy rains. Korea's is about 1,100∼1,400mm and it is concentrated fromJune to September. These natural disasters give the life and property damages in near region. In this study, it was performed that a stability in levee using seepage analysis. It has been evaluated hydraulic gradient of exit zone according to variations in levee crest width, gradient. As a result, it showed that hydraulic gradient of exit zone was decreased due to increase of levee crest width and gradient, and it was evaluated that vertical hydraulic gradient was decreased than that of the horizontal hydraulic gradient.