Because criminal law can eliminate the particularity of human freedom and even life, criminal litigation is particularly important compared with other litigation. As the basis of litigation, evidence is more important than other litigation. Among all kinds of evidence, illegal evidence is much more harmful! It is related to the protection of human rights in the process of obtaining evidence, even to the correctness of the judgment, and has absolute control over the fate of criminal suspects and defendants. Therefore, the exclusion of illegal evidence is particularly important! In this paper, in addition to a general exposition of the concept, characteristics, classification, and the concept and scope of illegal evidence, the author mainly expresses Zhu Xiang's views on the current legislation and practice of illegal evidence exclusion in China and his suggestions on constructing and perfecting the rules of illegal evidence exclusion.