According to classification research on circular economy patterns,  it is revealed that no scientific method has been applied on the basis of circular economy pattern to analyze quantitative relations between factors affecting main industry and industry chains. System simulation method is a better choice for solving such kind of problem. Thus, this article proposes a set of simulation method for analyzing large complex system such as coal industry,  and also points out range of application and limitations.  In the case study of YM Group,  simulation method is used to make detailed analyses of its circular economy pattern,  and results show that developing circular economy is beneficial to YM Group. Moreover, this study also illustrates the applicability of simulation method in analyzing circular economy pattern in coal industry.