Dibris Flow is a secondary hazard of volcano eruption disaster event this happened because influenced by one of factor that is rainfall. (Noor, 2006). Post-eruption of Mount Merapi Year 2010 and high rainfall in Mount Merapi causing dibris flow that hit some villages in river watersheds. One example of the affected in kuning and Opak river. The impact of dibris Flow is the occurrence of damage public and infrastructure facilities, the occurrence of damage to buildings and personal assets and local government, damaging livelihoods especially in agriculture. The research was conducted in kuning and opak river watersheds at Umbulharjo, Wukirsari and Bokoharjo Vilages. Data retrieval takes place from 17 July 2017 to 25 August 2017. Data analysis is done by determining the weight of some parameters based on the results of questionnaires / interviews from some experts and related experts that contains about how much influence a parameter on the level of danger and areas prone of debris flow. The results of analysis based on research in 2017 that level of dibris flow at Umbulharjo and Wukirsari vilages into the classification is very dangerous with each score total of 2,52 and 2,63. At Bokoharjo Village into in the classification of moderate hazards with a total score of 1,99. vulnerabitity of community due to debris flow at Umbulharjo, Wukirsari and Bokoharjo villages into Classification Vulnerable with each score total of 7,55 7,14 and 8,26. The level of community capacity at Umbulharjo Village is included the classification of tough disaster main village and Wukirsari and Bokoharjo Village included the classification of tough disaster madya village.