Legal analysis: the defense requires the signature of the parties. It is the right of the parties to defend, and it is also the defense in the name of the parties. Therefore, the parties should sign the defense, and the entrusted lawyer only puts forward opinions or submits evidence materials on behalf of the parties, and cannot sign the defense instead of the parties. Citizens, legal persons and other organizations may be parties to civil litigation. A legal person shall file a lawsuit by its legal representative. Other organizations are sued by their principal responsible persons. The parties have the right to entrust an agent, apply for withdrawal, collect and provide evidence, debate, request mediation, file an appeal and apply for enforcement.

Legal basis: Article 48 of the Civil Procedure Law of People's Republic of China (PRC). Citizens, legal persons and other organizations may be parties to civil litigation. A legal person shall file a lawsuit by its legal representative. Other organizations are sued by their principal responsible persons.