非法行为取得的被告人供述的证据能力如何确定,是我国刑事诉讼证据立法及理论研究的空白。构建我国的非法证据排除规则的核心问题在于通过何种程序确定非法取得的被告人供述的证据能力。在判断非法供述的证据能力过程中,应当赋予司法裁判者自由裁量权,结合案情具体判断,在“有效打击犯罪”与“保障被告人人权”两种价值之间进行平衡。 How to determine the evidence ability of defendant’s confession obtained by illegal act is the blank of legislation and theoretical research on the evidence of criminal proceedings in our country. The key issue in constructing the rule of exclusion of illegal evidence in our country lies in the procedure of determining the evidential capacity of the accused illegally obtained. In judging the evidentiary capacity of illegal confession, the judicial judge should be given the discretion to balance the two values ​​of “Effectively Combating Crimes ” and “Protecting the Human Rights of the Defendant ” according to the specific judgment of the case.