The purpose of this study is to evaluate the usability through the Korea Occupational Information System(KNOW) seeking improvements so that users can receive variety and accurate career and employment information. By utilizing the usability evaluation method to achieve the objectives of the research, we interviewed job seekers and employers to examined the problems of KNOW based on Usability testing of the questionnaire items derived from the professional experts. We looked Usability Evaluation of KNOW defined by ISO, into the effectiveness(information efficiency), effectiveness(information efficiency), Satisfaction(satisfaction of KNOW) and satisfaction (satisfaction KNOW) side. Improvements plan will be made in the investigation of the new job to reflect the rapidly changing world of work etc, the need arose to expand the incumbent samples in order to increase the reliability of the job information. It was required to reflect the reality that information is needed services to present information on custom jobs. Successful construction and operation information system starts from the understanding of the user. Users are required to strengthen vocational education utilizing information systems to enhance the utilization of the employment center staff as well as job seekers.