首先分析了传统TOPS IS方法的基本原理和计算步骤,指出了传统TOPS IS方法应用时存在的限制与不足,提出了基于计算机蒙特卡洛仿真方法与传统理想点方法相结合的思想,该方法可以利用评测所给的区间值,既方便表述评测结果,也充分利用了评测结果,更加接近实际情况,因而,有助于提高决策质量.最后,通过复杂工程系统设计决策一个算例验证了该法的可行性与有效性. Firstly, the basic principles and calculation steps of the traditional TOPS IS method are analyzed. The limitations and shortcomings of the traditional TOPS IS method are pointed out. The idea of ​​combining the Monte Carlo simulation method with the traditional ideal point method is proposed. Using the interval values ​​given by the evaluation, it not only makes it convenient to describe the evaluation results, but also makes full use of the evaluation results, which is closer to the actual situation and thus helps to improve the decision-making quality.Finally, an example of the design decision of complex engineering system is given to verify the method Feasibility and effectiveness.