Can eavesdropping be used as evidence?

Secret recording can be used as evidence, but if it is a secret recording, it infringes on the legitimate rights and interests of others or violates the prohibitive provisions of the law, the evidence obtained illegally is invalid, because the evidence obtained illegally cannot be used as the basis for evaluating the facts of the case.

Legal objectivity:

The evidence in Article 66 of the Civil Procedure Law of People's Republic of China (PRC) includes: (1) the statement of the parties; (2) Documentary evidence; (3) Physical evidence; (4) Audio-visual materials; (5) Electronic data; (6) Testimony of witnesses; (7) Appraisal opinions; (8) Records of the inquest. Evidence must be verified before it can be used as a basis for ascertaining facts.