This aims of this study to are, first (1) What are the factors and impacts that affect the occurrence of marriage of minors, second (2) How the immplementation of Child Protection Act in tackling the occurrence of marriage of minors. Theories used to analyze the problem are the legal theory of feminism and the theory of affectivennes and validity of law. The research method used is empirical research by doing same interviews and by reviewing same rules relating to underage marriage and Child Protection Act. Based on the research there are several factors that influence the occurence of marriage underage, those are the factors of pregnancy before marriage, economic factors, educational factors, soceity factors, and faith factorss. While the impact that occurs is the risk of distruption of reproductive organs, mental and emotional development in teenager, unable to continue education, until a divorce.  In this case it is expected that parents, communities, goverment and relevant institutions are expected to synergize each other to educate about the dangers of sex at an early age and the negative impact that will occur if the marriage of minnors. Revising The Child Protection Act is expected to prevent the occurrence of marriage of minors, and it expected that there are strict sanctions for those who do marriage under the age and for those who give permission for the marriage, because indirectly it is a form explaitation, especially againts underage girls.