Content of graduation theses is focused on civil divorce and church nullity of marriage. Graduation theses are divided in three Themes, secular law, canon law and comparison. First part is aimed at civil law which regulates divorce. Second part is focused on canon law. It conducts a study of church nullity of marriage in consequence of marriage agreement failure, canon form or impedimenta presence. Third part compares ways of marriage termination in Czech secular law and ways of marriage cessation in catholic canon law. It tries to find their equivalent components, their dissimilarities and relationship. The canon law is a base of comparison. Secular law is based upon the tenet of marriage dissolvability. Canon law is based upon the tenet of marriage indissolubleness. Marriage divorce in the civil law is ineffective in the canon law respectively church nullity of marriage is ineffective in the secular law of the Czech Republic.