"Gay marriage" system thinking Abstract : This paper is concerned "homosexuals having legal effect of the combination," by sociologists in recent years, Jurists and anthropologists hot issues of concern, on the one hand, from the nature of marriage attribute start. clear legitimacy and the right to set up sex marriage is not essential attribute. From the origin of marriage and the marriage ceremony concluded the process of view, Marriage is the name of publicity couples living together between the two, the combination of the essential attribute of marriage for formal recognition. But on the other hand, based on social development and human progress, the objective reality. Analysis of changes in the meaning of marriage to same-sex marriage explained the reasons, and on issues related to the legislative attempt, with the contemporary world, especially in China that the status of special groups, is given the special interest groups are legitimate and proper means and the recommendations. Keywords : homosexuality; The essence of marriage; Same-sex marriage