The purpose of this study is to propose a digital twin application plan according to the three stages of naval weapon system force development work. Firstly, in the planning stage, pre-conceptual research is currently performed by brainstorming and data research. Therefore, this study proposed to create and test a digital model in a virtual environment using digital twin technology. Secondly, in the acquisition stage, a plan was proposed to upgrade the digital twin system based on the previously established virtual environment. In the previous stage, M&S system is created and a digital twin modeling and sensors are created in the exploration and development stage. After that, advanced digital twin system will be built in the system development stage. Lastly, in the operation and maintenance stage, analyzing the data obtained from the real environment using the digital twin system, it predicts equipment failure and repair the broken equipment quickly. Next, a digital twin architecture suitable for the naval weapon system was proposed. The architecture consisted of a virtual-physical interaction module, a data integration module, and a knowledge calculation and visualization module.