In the field of electronic depository applications, the procedures for the collection, submission and preservation of electronic data evidence are not standardized enough, and there are problems with compatibility with the best evidence principle, and there are corresponding problems with the deposit procedures. Electronic data evidence can be accepted as evidence only after it was authenticated for authenticity, legitimacy, relevance and certification. In order to promote the optimization of the electronic data evidence identification mechanism, it is necessary to establish a unified certificate storage platform compatible with the notarization system, improve the electronic data judicial identification and cross-examination rules, and strengthen the credibility of the block chain in judicial practice.