自由证明并非是完全自由的证明方式。虽然自由证明可以免除严格证明的一部分或全部要件,但在证据采纳方面和证据调查方面依然存在一些限制。在证据采纳方面,自由证明要求证据至少要具备相当的关联性;可以采纳传闻证据,但必须保障来源可靠;相对于严格证明,自由证明对于非法证据的排除应较为宽松;在自由证明中并不要求最佳证据,但在证明力层次上要对非最佳证据进行限制。在证据调查方面,自由证明过程中必须保障当事人的知情权和异议权,并且裁判者必须遵守心证公开制度,防止其心证过程不遵循经验法则和逻辑法则。 Free proof is not a completely free way to prove. Although free proof can be exempt from some or all of the elements of the strict proof, there are still some limitations on the evidence-taking and evidence-based investigations. In respect of the adoption of evidence, the proof of freedom requires that the evidence be at least relevant; the hearsay evidence can be adopted but the sources of protection must be reliable; the proof of liberty should be more lenient than the strict proof in the exclusion of illegitimate evidence; The best evidence is required, but non-best evidence is limited at the proof level. In the investigation of evidence, the process of proof of freedom must protect the parties’ right to know and the right of dissent, and the referees must abide by the system of publicizing the card and prevent the process of their testimony from not following the rules of experience and logic.