: The aim of this research is identified, mapping flooded areas in eks karesidenan surakarta, and performs analysis of flood disaster mitigation. The analysis used is geography information systems and contingent valuation methods. by calculating the willingness to pay (WTP) to reduce the risk of flood disaster and the factors that affect the WTP. The subject of this research are farmers in the basin of the river Bengawan Solo River in Klaten, Sukoharjo, Karanganyar and Sragen. The result showed that variable income, age, education and the number of members of the family has influence significantly to a willingness to pay, perform the act of mitigating flood, and the average willingness to pay farmers/ respondents only between rp.250.000-rp.500.000 for flood mitigation. Respondents/ farmers in the Bengawan Solo River basin if having flooded, they suffered losses farming production, an average of 50% of the normal production.