By analyzing the development status and trend of US military weapon data link, and provides a reference for the development and construction of our military weapon data link. This paper introduces the basic concept and functional characteristics of the weapon data link system, and summarizes the development status of the US military weapon data link, and analyzes the future development trend. The analysis results show that our military should strengthen the construction of the weapon data link system in the fields of networking, standardization and generalization, and pay attention to the foresight in the top-level design, referring to the development idea of the US military weapon data link.