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It is very useful tool to get necessary informations by process and case of construction work for preventing of the construction calamity and accident. What is the most important thing among the informations is considered to evaluate the degree of risk in the each construction process to prepare the safety planning. Past construction accidents contain the information of construction safety method and hazard of construction activity. So, to prevent construction accident, we utilize the past construction accidents properties. Therefore the research is carried out prevent construction accident using the past accidents example like us a risk properties. Firstly we re-categorized work type based on the past accidents, and analyzed accidents depending on the number of persons by work types. secondly we collected the construction specialists, opinion about the risk by work types. With the result of risk work type applied AHP(Analytic Hierarchy Process) method, we compared these result. finally we suggested the risk index of each work type and process.