First of all, testimony can be used as evidence. According to Article 48 of the Criminal Procedure Law, all materials that can be used to prove the facts of a case are evidence.

Evidence includes:

(1) Physical evidence;

(2) Documentary evidence;

(3) Testimony of witnesses;

(4) the victim's statement;

(5) confessions and excuses of criminal suspects and defendants;

(6) Appraisal opinions;

(7) Records of inquests, inspections, appraisals, investigations and experiments;

(8) Audio-visual materials and electronic data.

The evidence must be verified before it can be used as the basis for finalizing the case.

Secondly, the court has the power to verify the evidence, which means that the court should verify the relevant evidence before accepting the evidence. According to Article 52 of the Criminal Procedure Law, people's courts, people's procuratorates and public security organs have the right to collect and obtain evidence from relevant units and individuals. The relevant units and individuals shall truthfully provide evidence.

Evidence materials such as physical evidence, documentary evidence, audio-visual materials and electronic data collected by administrative organs in the process of administrative law enforcement and case investigation can be used as evidence in criminal proceedings.

Evidence involving state secrets, commercial secrets and personal privacy shall be kept confidential.

Whoever forges, conceals or destroys evidence, and whoever the evidence belongs to, will be investigated by law.

Article 60 stipulates that anyone who knows the circumstances of a case has the obligation to testify.

A person who is physically and mentally defective or young, can't distinguish right from wrong and can't express correctly, can't be a witness.