In civil cases, whoever advocates proof needs to provide relevant evidence for the facts he advocates. If you hire a lawyer, you can also get evidence with the help of a lawyer. Criminal evidence is collected by public security organs.
Legal basis:
Article 43 of the Criminal Procedure Law of People's Republic of China (PRC) * * * Defence lawyers may, with the consent of witnesses or other relevant units and individuals, collect materials related to the case from them, apply to the people's procuratorate or the people's court to collect and obtain evidence, or apply to the people's court to notify witnesses to testify in court. With the permission of the people's procuratorate or the people's court, and with the consent of the victim or his close relatives or witnesses provided by the victim, the defense lawyer may collect materials related to the case from them.
According to Article 64 of the Civil Procedure Law of People's Republic of China (PRC), the parties have the responsibility to provide evidence for their claims. The people's court shall investigate and collect evidence that the parties and their agents ad litem cannot collect on their own due to objective reasons, or evidence that the people's court considers necessary for hearing a case. The people's court shall comprehensively and objectively examine and verify the evidence in accordance with legal procedures.