It is to break away from semantics dilemma that "evidence" is "having evidence" or evidence is "real evidence”, the author puts forward a concept of non-evidence referred no evidence transformed from "having evidence" and false evidence from "true evidence”."Non-evidence" concept has a legal systematic support such as the basic principle of presumption of innocence and the exclusionary rules of evidence as well as standard of proof “beyond a reasonable doubt”.In a dynamic process, non-evidence may contain the contents of the two stages, "no evidence of guilt" from the "start" as factual non-evidence and proof without "beyond a reasonable doubt" so having evidence of innocence to "the end" as legal non-evidence. Those two layers of "evidentiary barriers" to some extent lay on both a particular organization mechanism of functional divisions among participants and binary separation of powers between judge and jury, and operation mechanism such as procedural adjudication, proof of prima facie, burden of persuasion and others.