In addition to the development of advanced weapon system development technology, the domestic defense capability improvement project also requires gradual change and development in the field of test evaluation of weapon system R&D projects. Weapon system R&D projects utilies system engineering (SE) processes to verify and confirm performance through clear system requirement analysis and test evaluation, which is proceed with procedures of military strength and mass-production. The ROC, which is a system requirement, can be developed by modifying the ROC if necessary for efficient R&D before and during system development, but it is not easy to apply in reality. Although the weapon systems were developed through a detailed SE technical review with the aim of implementing major ROCs, some performance was found to be insufficient compared to the development target during test evaluation, resulting in suspension of projects, delays in power void (e.g., K-2 tanks). While the importance and reliability requirements for test evaluation, which is the final verification stage of weapon systems performance, for some systems that lack performance, effective improvement measures for the development of domestic defense improvement projects are required due to the standardized current test evaluation and judgment system. In this paper, the current status of the domestic weapons system R&D environment is first studied in terms of systematic engineering processes and based on this, we present test evaluation development ways by considering the characteristics of the test evaluation criteria, the need to expand the scope of ROC and R&D application, and the determination plan of the test evaluation result.