This paper research explained about slope stability of earthen dams using GEOSTUDIO software. Generally, in earthen dams, the factors included in this analysis are the specific site, foundation conditions, construction material characteristics and hazard potential associated with the particular site. To control the slope failures it is important to analyze the factor of safety of the slopes. To derive factor of safety, the tests are carried out by using numerical modeling of SLOPE/W and SEEP/W tools of GEOSTUDIO software for steady state seepage and sudden drawdown conditions. In this paper factor of safeties are analyzed for four cases, such as (i) without berm without the drained blanket (ii) with berm without a drained blanket (iii) without berm with the drained blanket and (iv) with berm with the drained blanket. Out of four cases, the best case to improve the factor of safety of the slope is (iv) with berm with the drained blanket of the earthen dam.