The school's strategy in decreasing disaster risk is improving flood disaster mitigation knowledge at SMA Negeri 1 Welahan management policy, planning and school organization is a strategy as a reference to the disaster preparedness school. This article aims to determine the level of students' knowledge in disaster mitigation and school strategy in facing the flood disaster. The data analysis method is test correlation of product moment that used questionnaire, in-depth interviewing, direct

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... rvation, and documentation. The population of this study was all of the students that is 876 students by using stratified random sampling. The results of this study are the knowledge of SMA Negeri 1 Welahan students about disaster mitigation in the pre-disaster phase of 79.32%,during disaster is at 66.66% and postdisaster is 63.21% that presentation is in high category whereas based on the correlation test there is a significant positive relationship between the students' knowledge level to flood with the ability to dealing with flood disaster. That relationship is indicated by a correlation result of 0.613 or p = 0.023 (p = 0.023< 0.05) high disaster mitigation. In addition, the school's strategy is to elevate the new school building, develop management policy, planning and emergency response organizations and SOP (Standard Operational Procedures) related to flood disaster mitigation, that is done as a school strategy which will be the reference for disaster preparedness schools.