Marriage is a universal social institution to fulfill our basic human social needs. As a social institution, it consists of some rules, regulations, custom, and traditions etc. which are accepted by the society. Every society has own traditions, customary laws to perform their marriage ceremony. Missing tribes of Assam also have their own traditions which are different from other society. They believe that marriage as a sacrament and followed all the unwritten marriage codes which are prescribed by their forefathers. The system of marriage is different from each society for their different socio-cultural, economic and religious background. But the main aim of marriage is same in every society.