Abstract: In order to study the solution of kill chain reconstruction in mosaic warfare systems, an autonomous emergency decisionmaking method of the combat module under mosaic warfare is proposed. First, the concept of mosaic warfare and the necessity of reconstruction of its combat modules are introduced; secondly, combined with the PREA (Planning – Readiness – Execution – Assessment) loop, a combat module evaluation model based on the hesitant fuzzy is constructed. This model constructs an evaluation attribute system for combat modules, and calculates the attribute weights through the maximum deviation method, thereby determining the order of preference for module reconstruction. This method compensates for the uncertainty and hesitation in the evaluation of emergency decision-making, and the case analysis results also show the feasibility and effectiveness of this method.