Legal analysis: Whether the criminal appeal submitted by the lawyer requires the signature of the defendant needs to be verified and determined based on the actual situation. Since the right of appeal belongs to the defendant, the signature of the appeal petition should be signed by the party concerned. However, if the defendant has authorized a lawyer to appeal and has the right to sign, the lawyer can sign according to the authorization contract and submit the appeal. For specific circumstances, the parties concerned are requested to verify and determine by themselves based on the actual situation and relevant legal provisions.

Legal basis: "Civil Procedure Law of the People's Republic of China" Article 216 The defendant, private prosecutor and their legal representatives shall not accept the first instance of the local people's court at all levels. Judgments and rulings shall have the right to appeal in writing or orally to the people's court at the next higher level. The defendant's defender and close relatives may appeal with the defendant's consent. Parties to an incidental civil lawsuit and their legal representatives may appeal against the incidental civil lawsuit part of the first-instance judgments and rulings of local people's courts at all levels.

The defendant’s right to appeal shall not be denied under any pretext