污点证人是一种特殊的证人,具有双重身份,即兼具犯罪嫌疑人和证人的身份。从经济学、诉讼基本价值以及司法资源合理配置等角度分析了污点证人作证的必然性和必要性;我国刑事法的规定为污点证人不起诉制度提供了法律基础。本文认为加强我国污点证人作证保障制度,应确立污点证人不起诉制度。 Tainted witness is a special kind of witness who has dual identities, that is, the identities of criminal suspects and witnesses. From the perspectives of economics, the basic value of lawsuits and the rational allocation of judicial resources, the inevitability and necessity of testifying stain witnesses are analyzed. The provisions of criminal law in our country provide the legal basis for the non-prosecution system of tainted witnesses. This article believes that to strengthen the witness testimony testifying system in our country, we should establish a system that does not prosecute witnesses who stain the testimony.