According to the judicial interpretation of the Civil Procedure Law, under normal circumstances, a document issued by a unit is a legal and effective legal document only if it is stamped with its official seal and signed by its legal representative or person in charge. If the signature of the person in charge is not signed by himself, if the facts are ascertained, of course, the effectiveness of such litigation documents may be questioned, but whether it is effective depends on the actual situation and it is not easy to draw conclusions.