In order to solve the intractable branching problem in the complex system reasoning with the standard QSIM algorithm,the paper proposes a decomposing algorithm.

• 应用系统聚类分析和因果图分析方法将定性模型分解成单元,这样对聚类分解成的单元进行集成QSIM推理,可大大降低QSIM算法的不可控分枝,提高系统的仿真效率。