Abstract: Operational task decomposition is a key step for the military operation planning in computer-aided decision-making. To this end，a multi-scheme task decomposition and selection framework is presented. A standard task description method is proposed to realize the quantitative operational task description based on 5W theory. A task decomposition model is established according to task scenario and domain knowledge，which formulates the task decomposition as a multi-constraint optimization problem and alleviates the problem complexity caused by various influential factors and constraints. A hierarchical task decomposition method is presented to generate the multiple solutions and further finalize an optimized solution，which overcomes the unavailability of sufficient task decomposition and optimization means.The proposed method is validated based on a specific battle task decomposition，and the simulated results demonstrate the effectiveness and practicability of the proposed method，achieving over 90% optimum rate.

Key words: operationaltask, taskplanning, operationaltaskdecomposition, standarddescription, hierarchicaltasknetwork, effectiveinformation