A letter of introduction from a law firm shall be submitted by the lawyer to the case-handling organ. For the parties who need to provide legal aid, the law firm may entrust a lawyer to undertake it, and handle the entrustment formalities according to the regulations. After accepting the entrustment, the law firm shall register and put on record, and establish files after numbering. After accepting the entrustment, a lawyer shall not refuse to defend or represent him without justifiable reasons.
Article 25 of the Lawyers Law of People's Republic of China (PRC)
When a lawyer undertakes business, the law firm shall accept the entrustment uniformly, sign a written entrustment contract with the client, collect fees uniformly according to the provisions of the state and record them truthfully.
Law firms and lawyers shall pay taxes according to law.