In archaeology the marital shapes in primitive society have not been involved so much,but we may have a general understanding about them from such phases as mixed marriage,bloodline group marriage,non-bloodline group marriage,dual marriage and monogamy.

Based on the historical mertials and documents,combined with other scholars′ point of view about ex clan marriage formation,and national minority′s marriage shap in modern society, ancient literatures,archaeological discovery,etc.

Under its 500-year rule, Koryo had adopted a marriage system between its royal families, which underwent an evolutionary process and changed from the marriage between half brothers and sisters, cousin marriage and consanguinity marriage, to its prohibition decree against consanguinity marriage.