The purpose of this article is to review the limit on the victim’s right to dispose of life from the perspective of paternalism. The focus would be the legitimacy of the offence of assisted suicide. After reviewing all the attempts to justify the paternalism，the author finds that the soft paternalism，which allows the governmental involvement in the case lack of voluntariness，is compatible with the liberalism and can avoid following the typical logic of paternalism. The author holds that instead of the high level of voluntariness，which is argued by the soft paternalism，the natural competence of autonomy should have sufficed for the requirement of voluntariness. In this context，all the behaviors prescribed as the offence of assisted suicide have preconditioned the voluntariness of the victim. Therefore，there is no legitimacy for this offence.