Abstract: Central to robot ethics are the issues of moral responsibility agent and responsibility distribution. This essay argues that the designer, manufacturer and user of robot should be responsible for the consequences of its operation while robot has increasing autonomous and learning ability. It is necessary to identify the assignment of moral responsibility and set up possible mechanism in order to avoid “organized irresponsibility”. In addition, the majority of legal scholars argue that manufacturer, seller and user, not the vehicle itself, should be responsible for accidents caused by autonomous vehicle, which prove the rationality of moral responsibility distribution in robot ethics.