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The accuracy of cost estimating is becoming important for cost management and a successful bid, because of increasing uncertainty of construction market and decreasing construction amount. The purpose of this research is to figure out a plan for improving the accuracy of early cost estimating based on the review of the actual work condition, work process and previous research and the problems of cost estimating work in domestic construction company. The results of analysing importance index based on cost estimating skills which utilize check list, project scope description, standard work procedure are high ranked. But construction companies barely utilize these, therefore it is recommended for them to incorporate effective utilization of estimate practices in early construction project phase. Thus, project scope description which provides important information of estimating are proposed and two estimate practice process for improving estimate practice are also proposed.