The purpose of this study is to improve the automatic scoring program of Korean supply-type items and to increase application of the program for effectiveness of scoring and reliable scoring. For the trial application of the automatic scoring program, I scored 17 supply-type Korean items of the 2012 NAEA(National Assessments of Educational Achievement). The numbers of answer were 3,010 of each Korean item. The results of the 2012 NAEA items demonstrated that the scoring rate was quite high, 97~100%, and Kappa coefficients were high (at over .97). The rate of scoring errors was 0~0.5%. The error rate of most items was very small (under 1%). The sources of scoring errors were either spelling errors or the non-recognition of analogous terms, and symbols. The ability to use automatic scoring program in operational scoring environments, such as the NAEA, reduces the time and cost associated with having multiple human scorers score answers of supply-type items. Therefore, an automatic scoring would appear to be a favorable solution with respect of both the introduction of more supply-type items on high-stakes standardized tests and on the lower stakes classroom-instruction environment.