Watershed (DAS) is an integral component of the ecosystem that consists of biotic and abiotis and can not be separated from each other between components as well as having distinctive characteristics, both in hydrology, land cover, socio-cultural and economic surrounding. Watershed functions and plays a basic role as a region that receives, holds and drain the water through a single outlet. However, the role and function of the watershed is influenced by changes in land cover. This study aims to analyze the GenRiver Hydrology Model and predict changes in water balance Sub-watershed simulation Goseng with different land cover conditions. Watershed (DAS) is an integral component of the ecosystem that consists of biotic and abiotis and can not be separated from each other between components as well as having distinctive characteristics, both in hydrology, land cover, socio-cultural and economic surrounding. Watershed functions and plays a basic role as a region that receives, holds and drain the water through a single outlet. However, the role and function of the watershed is influenced by changes in land cover. This study aims to analyze the GenRiver Hydrology Model and predict changes in water balance Sub-watershed simulation Goseng with different land cover conditions. The research method used is to use and analyze the model Generic Riverflow (GenRiver) and use simulation to determine the changes in land cover changes in water balance in the sub watershed Goseng. Relief devices used in this model is to use Stella as software associated with Microsoft Excel files. The parameters considered in this model of climatological data, landform, soils, geology and land cover.