As evidentiary materials addressing specialized issues in ecological litigation, environmental damage judicial appraisal plays a crucial role, but their validity as evidence for establishing case facts untimately requires judicial confirmation. As a type of evidence, environmental damage judicial appraisals should assist rather than replace judicial decision-making. Therefore, under the objective need for environmental damage judicial appraisals to support judicial decisions, the limits of this support should be clarified. However, in cases where the judicial appraisal results are consistent, or inconsistent, or the opinions are unclear, judges face significant challenge in accurately admitting the appraisal opinions. In order to further activate the function of environmental damage judicial appraisal in supporting judges’ judgments, it is necessary to encourage appraisers to appear in court, strengthen the questioning of expert assistants, and explore the technical assessor system in the trial process to improve judges’ substantive review capabilities. At the technical level, the auxiliary judgment function of environmental damage judicial appraisal is enriched by expanding the judicial application of the virtual governance cost method and artificial intelligence.