Abstract: Extreme rainfall can cause flood and bring bad impact to the agricultural sector. Indonesia has extreme rainfall in several region such as West Java, where the lowland area is at the northern region and the highland area is at the southern. The Global Circulation Models (GCM) output data can be used to get informations about rainfall. Statistical downscaling (SD) is the technique which can be used to analyze the functional relationship between local scale data (rainfall) and global scale data (GCM output) using statistical method.