Apply to the court for the identity information of the defendant.

Legal analysis: the method for an individual to apply to the police station to investigate the identity information of the defendant: after filing a case, apply to the court for retrieval or filing a case. If an individual inquires, the court needs to issue a letter of investigation and evidence collection; If it is necessary for filing a case, it needs to be searched before filing a case. It is recommended to entrust a lawyer to retrieve it. If the defendant is an individual, he can apply to the court to issue a letter of assistance in investigation, and then go to the police station to obtain household registration information. If the defendant is a unit, he can also find a lawyer to obtain business information.

Legal basis: People's Republic of China (PRC) Lawyers Law.

Article 35 An entrusted lawyer may, according to the needs of a case, apply to a people's procuratorate or a people's court to collect and obtain evidence, or apply to a people's court to notify 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.

Article 38 A lawyer shall keep the state secrets and business secrets he knows in his practice, and shall not disclose the privacy of his clients. Lawyers should keep confidential the relevant information and materials that their clients and others are unwilling to disclose in their practice activities. However, criminal facts and information that endanger national security, public safety and seriously endanger the personal safety of others are excluded.