Due to the complexity of data and the urgency of time, traditional methods can only focus on a single element when processing battlefield information, which may result in the omission of key information. Knowledge graph has the inherent advantage of integrating multi-dimensional and multi category data, providing a feasible solution for focusing on multi element processing of battlefield information. Therefore, we proposes a framework for constructing a military domain knowledge graph that integrates multi-dimensional battlefield elements, fine-tuning the CasRel model to more accurately extract entity relationships. Then, based on this framework, a semi automated island chain knowledge graph is constructed and an application example is given. The graph can comprehensively and accurately express the geographical, military, political and other aspects of the island chain region, providing important support for military decision-making of multi-dimensional battlefield elements.