Legal theories have two general explanations for an act of state. One is act of state in a general sense，the other is act of state under the remedy law. Exit and entry administration is an act by which the state exercises its sovereignty. It can thus been seen as an act of state in a general sense. But at the present moment，whether or not exit and entry constitutes an act of state under the remedy law is a contentious issue in academic circles. In terms of exit and entry administration，we need to analyze its subject and nature of behavior and draw conclusions on a case-by-case basis. The most controversial acts are issuing visas for aliens and deporting aliens from the country. However，these two acts are not absolutely involved in the act of state under the remedy law according to theoretical analysis，legislation，or juridical practice.