Conflicts between the right to privacy and faithful obligation in spouse are complex problems in our country. With the development of society, problems are getting so obvious and severe that they relate not only to the integrity of the marriage system, but also to the social harmony and stability. Since the revision of the Marriage Law, People's Republic of China Supreme People's Court issued three judicial interpretations, none of which mentioned essential guidance for these problems yet. It will come out the conclusions and solution if we have a better understanding of faithful obligation and the right to privacy in marriage,and discussion of the situation and reasons of these conflicts between them.