1. According to the litigation request put forward by the parties, they have the responsibility to provide evidence. This is the law's stipulation on the burden of proof in general civil cases, that is, "whoever advocates, who gives evidence", which puts forward higher requirements for the parties' ability to give evidence. In practice, when many parties need to go to some state organs, banks and enterprises for evidence collection because of litigation, these departments often refuse to provide the obtained information on the grounds of confidentiality. The lawyer's investigation order was issued by the court, because the investigation order was obtained on behalf of the court;
2. When some legal reasons prevent the parties from collecting evidence, the judge will investigate and collect evidence ex officio or at the request of the parties. This way will make the judge contact with the evidence in advance, lead to the premature formation of the evaluation evidence of the judge, and the neutrality of the judge's intermediate judgment will be questioned. By issuing a lawyer's investigation order, the lawyer can investigate and collect evidence with the investigation order, which can avoid the above conflict.
Legal basis: Article 28 of the Lawyers Law of People's Republic of China (PRC).
Lawyers can 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.