The objectives of this study are as follows：First, to analyze the actual conditions faced by the Forestry Corporation(FC); second, to estimate efficiency of FC using Data Envelopment Analysis(DEA); third, to provide the basic data to enhance the competitiveness by streamlining management of FC. FC system was introduced for the purpose of deregulation rather than activating the management of private forest. The efficiency of the 48 FC was analyzed by using DEA model. The technical efficiency, pure technical efficiency, and scale efficiency measure of the FC is o.38, o.64, and 0.61 respectively. Among the 48 FC, the number of efficient FC whose efficiency value was 1 was ① 4(8.3%) in the technical efficiency, ② 10(20.8%) in the pure technical efficiency, ③ 4(8.3%) in scale efficiency. Among the 48 FC, the number of inefficient FC whose efficiency value was less than 1 was ① 44(91.7%) in the technical efficiency, ② 38(79.2%) in the pure technical efficiency, ③ 44(91.7%) in scale efficiency. Among the 48 FC, the number of Increasing Returns to Scale (IRS)-type FC was analyzed to be 44(91.7%). The number of Constant Returns to Scale (CRS)-type FC was analyzed to be 4(8.3%). Since an increase in input is lower than an increase in output in IRS, an increase in input factors such as investments is required.