As everyone knows, systems science is a new discipline for scientific methodology. Systems science researches the common characteristics of all complex systems in nature and human society, exploring the universal laws in the generation, the evolution and the emergence of systems in general. Classical science pays attention to the reductive analysis while the systems science emphasizes holistic grasp, with substantial distinction in methodology. In this paper we first review our important achievements in systems science methodology, next introduce the results in description method using operations research, emphasizing the use of network modelling and analysis in the research methods of systems science.%众所周知，系统科学是适应科学方法论的变革而产生的新学科．系统科学研究自然界和人类社会各类复杂系统的共同特性，探索系统的生成、演化和涌现的普遍规律．系统科学与经典科学在方法论上有着本质的区别．经典科学注重还原分析，而系统科学强调整体把握．该文首先回顾我国在系统科学方法论上所取得的重要成果，接着简介作者从运筹学角度对描述方法所做的研究，然后着重探讨网络科学的研究方法对系统科学的借鉴作用．
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