The path planning for warshipaircraft joint operation is studied.Firstlythe weapon system of the destroyer is analyzed to obtain the safe distance when the shipboard helicopter and the destroyer are performing a task cooperatively.Since the traditional A* algorithm cannot be applied directly to the path planning for warshipaircraft joint operationthe security costs and the path safety factor are introduced.An improved weighted A* algorithm is given based on the traditional algorithmto solve the path planning problem for warshipaircraft joint operation.Finallya case simulation is given to verify the effectiveness of the improved algorithm.