Legal analysis: you can refuse to sign if you receive a letter from a lawyer. The lawyer's letter is only a notice and can be refused. Lawyer's letter is essentially 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. The lawyer's letter must be signed and sealed by the lawyer, and the representative is legally responsible for this letter. If not, forge it. In case of threats, intimidation, losses, etc. , can report to the public security organs, shall be investigated for the responsibility of the parties and lawyers.

Legal basis: Article 28 of the Lawyers Law of People's Republic of China (PRC) may engage in the following businesses:

(a) to accept the entrustment of natural persons, legal persons or other organizations as legal advisers;

(two) to accept the entrustment of the parties in civil cases and administrative cases, to act as agents and to participate in litigation;

(3) Accepting the entrustment of criminal suspects and defendants in criminal cases or legal aid agencies to act as defenders according to law, accepting the entrustment of private prosecutors in private prosecution cases, victims in public prosecution cases or their close relatives to participate in litigation as agents;

(four) to accept the entrustment and represent the complaints of various litigation cases;

(five) to accept the entrustment and participate in mediation and arbitration activities;

(6) Accepting entrustment to provide non-litigation legal services;

(seven) to answer questions about the law and write litigation documents and other documents related to legal affairs.