This study studied the weapon system quality index evaluation method as a way to strengthen quality improvement activities in the operation and maintenance stage of the military weapon system using quality index evaluation techniques that are actively implemented from the customer and market perspective for various products and service activities produced by private companies. Whether military or private, quality control of products has something in common with low quality source blocking and using high-quality products. The research method of this study first reviewed previous research data on the field of defense quality to improve the quality of weapons systems, identified the military's defense quality certification system, and sought the required development direction after comparative analysis. Second, in order to develop the weapon system quality evaluation index, the automobile quality index evaluation case, which is a representative quality evaluation of the private sector applicable to the military, was studied and its applicability to the weapon system was suggested. Third, based on the automobile quality index evaluation case, 74 experts' opinions and surveys were conducted on the evaluation factors for measuring the inorganic quality index, and the identified evaluation factors were stratified and the importance (weight) was analyzed using the AHP technique. Fourth, by applying the importance (weight) of each evaluation element, the evaluation element was applied to the ground (K-series 000 3types) weapon system under the same conditions. Given that the military's weapon system has special characteristics such as various operational requirements operation rate guarantees lifespan maintenance and total cost optimization it is expected that the current quality improvement requirements will be strengthened from various perspectives quality certification will be enhanced when export of K-broadcasting and quality needs of consumers will be more actively reflected.