The high uncertainty of battlefield environment leads to some emergencies in the course of a battle. These events mainly include the emergence of new tasks and the failure of platform entities. In order to cope with emergencies in a battle, in the face of changes in the battlefield environment, the task plan formulated before the operation needs to be adjusted in the course of operations, and the adjustment of wartime task plan is a difficult issue in the field of command and control. Firstly, the components of the command and control organization are described, the constraints in the task plan adjustment are analyzed, a mathematical model is established, which takes the minimum mission completion time as the objective function, and task completion quality, task insertion order and adjustment stability as the constraints. Then, a mission planning adjustment algorithm based on the feasible task execution sequence and the greedy algorithm is proposed. The design ideas of adjustment method and detailed steps of the task plan adjustment method are given. Finally, combined with the joint landing operations case simulation, the simulation experiment verifies the feasibility and effectiveness of the method in dealing with emergencies.