一、民事诉讼当事人追加制度的理论综述民事诉讼法第119条规定：“必须共同进行诉讼的当事人没有参加诉讼的，人民法院应当通知其参加诉讼。”据此，在民事诉讼法学上，有关当事人追加制度的理论观点，可以概述如下：1．追加当事人是指民事诉讼中必须共同进行诉讼的当事人没有 First, the theory of additional parties to civil litigation theory Article 119 of the Civil Procedure Law states: “If the litigants must participate in the litigation without participating in the litigation, the people’s court should notify them to participate in the litigation.” Accordingly, in the civil litigation jurisprudence, the parties concerned The theoretical view of the additional system can be summarized as follows: 1. The additional parties mean that the parties involved in the litigation must not be involved in the civil proceedings