Based on the verses about the law and marriage ethics in Mark's Gospel, this paper pointed out that in Mark's mind the actions of Jesus' disciples are rooted in their relationship with Him within Christian community characterized by church. Therefore the law ethics of God's Kingdom would have been based on its people's relation with Jesus, and on the relation between Jesus and God in Himself, while the marriage ethics of Jesus on His faith in that God created male and female in the beginning, and on His identity as God's man. This kind of idea of ethics is against those in the Greco-roman world, Jewish world and contemporary age.