D-S evidence theory is a very useful tool in dealing with uncertainty problems, but counter-intuitive results are often obtained in intelligent reasoning. Haenni gave some confutation based on Zadeh's criticism of Dempster rule of combination. However, the reasons for conflict among evidences given by Haenni are not comprehensive. In this paper, the reasons for conflict among evidences are analyzed and summarized. One reason is that sensors are disturbed. The other is that the framework is not integrated, which also includes incomplete elements in the framework, new objects outside the framework, and lost objects leading to potential conflict in the reasoning process of two evidences.