1. Environmental public welfare organizations initially provided evidence to prove that the defendant's behavior harmed the public interest or had a significant risk of harming the public interest: the indicators were abnormal; Name, discharge mode, discharge concentration and total amount of major pollutants, and excessive discharge.
2. Environmental public welfare organizations provide evidence of the objective existence of pollution behavior: pollution source environmental monitoring report, sewage declaration form, enterprise production record, environmental protection facility operation record, and environmental pollution damage accident report.
3. Environmental public welfare organizations provide evidence that environmental public welfare has been or may be damaged: detection, inspection and monitoring reports of damaged water bodies, land, air and their environment, and monitoring reports of acoustic environmental quality. To meet the above three aspects of proof, the court can require the defendant to bear the lawyer's fee according to the existing judicial interpretation of environmental civil public interest litigation.