Why didn't China promulgate a unified "Evidence Law"?

In different types of litigation, the standard of proof of evidence is different and each has its own characteristics, so it is difficult to form a unified "evidence law". China has not yet formed a relatively unified code of evidence law, but it is scattered in procedural law, organizational law and judicial interpretation. Moreover, there are still many disputes about whether to formulate a unified evidence code in China.

As the sum total of all legal norms that specify the collection, examination, judgment and application of litigation evidence, evidence law, like other legal systems, is a product of class society and a superstructure formed with the changes of social and economic foundation.

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In a narrow sense, the law of evidence is a law to solve some standards of actions and facts of litigants in determining the facts of a case and the problem of litigation risk sharing.

Evidence law in a broad sense is the sum of laws and regulations on the collection, production, preservation, submission and application of evidence. Evidence law is essentially a kind of legal "cognitive law", which is based on experience and the basic method is probabilistic. Therefore, no law of evidence can be a natural law of fact finding.