This article discusses the relationship between state law and customary law,especially concerns the theme of “the third realm” proposed by Philip C.C.Huang and the “division of the state and society” responded by Zhiping Liang.State law is not separated from customary law;and also “the third field” is not existed between or outside them,it is existed in a contested field affected by multiple authority.In this contested arena,various authorities take part in it for the resolution of the dispute by mobilizing the cultural and powerful capital.So the relationship between state law and customary law is inter infiltrative,inter influential,and inter contested.