Triggered by the documents unearthed in recent years, the issues concerning the re-classification of the academic schools of Pre-Qin philosophers have generated new discussions among contemporary scholars. This article discusses the inner logic of the views put forward by both Chinese and foreign scholars since Hu Shi(胡适), pointing out that their differences stem from their failure to understand the nature of the classification properly. The classification of academic schools is an issue of taxonomy, and therefore it is also a relative conception. True that the views held by the ancient scholars are important, but their ways of classification are not necessarily more scientific than those put forward by the scholars in later times. Moreover, we should pay attention to the consistency of the criteria for the classification of academic schools, and also fully understand the relativity of the classification which often serves a specific purpose. It is meaningless to simply negate the view of Six Schools of Philosophy by Sima Tan (司马谈), or the view of Nine or Ten Schools of Philosophy by Liu Xiang (刘向).