Legal analysis: 1, signature, handwritten printing is ok. 2. The lawyer's letter is stamped with the official seal of the law firm. A lawyer's letter refers to a professional legal document made and issued by a lawyer to disclose and evaluate relevant facts or legal issues, and then make a request to achieve a certain effect. The essence of lawyer's letter is a legal act of entrusting an agent to express his will, which plays an important role in safeguarding the legitimate rights and interests of the parties. However, the lawyer's letter is not really effective and needs the approval of the court. If the court does not recognize it, it is invalid.

Legal basis: Article 133 of the Civil Law of People's Republic of China (PRC) is an act of civil subjects to establish, change and terminate civil legal relations through the expression of will.

Article 29 of the Lawyers Law of People's Republic of China (PRC) * * * Lawyers, as legal advisers, shall provide legal advice to clients, draft and review legal documents, and participate in litigation as agents.

Mediation or arbitration activities, handle other entrusted legal affairs, and safeguard the legitimate rights and interests of clients.