Legal analysis: The lawyer's investigation order is a system, mainly to improve the party's ability to provide evidence. Because the existence of lawyer's investigation order can enhance the ability of investigation and evidence collection, facilitate the parties to provide more effective evidence in the trial of the case, and improve the ability of the parties to safeguard their own rights and interests. The implementation of the lawyer's investigation order system is conducive to improving the ability of the parties to provide evidence. If the law expressly stipulates that lawyers should investigate and collect evidence by themselves, they can investigate the situation related to undertaking legal affairs with the lawyer's practice certificate and the certificate of the law firm.
Legal basis: Article 35 of the Lawyers Law of People's Republic of China (PRC). According to the needs of the case, the entrusted lawyer may apply to the people's procuratorate or the people's court for collecting and obtaining evidence or to the people's court for notifying witnesses to testify in court. If a lawyer investigates and collects evidence by himself, he may, with the lawyer's practice certificate and the certificate of the law firm, investigate the situation related to undertaking legal affairs with the relevant units or individuals.