《恒先》者,上海博物馆所藏之古佚书也。全书十三简,五百一十二字。第三简背有“恒先”字样,因以为名。李零认为其为一部首尾完具之道家著作。从内容观之,此言诚是也。由于其已湮灭二千余年,又不见于传世文献,加之思想深邃,故其甫一面世,即颇受学人青睐,遂兴起研究之热。然研究虽多,分歧亦繁。此分歧既包含文字释读与竹简编联,又涉及文意解读与思想阐释。就竹简编联而言,目前所见有李零、庞朴、顾史考、夏德安、曹峰诸种方案。其中,庞朴之说渐居主 “Foremost,” who, Shanghai Museum of the ancient lost the book also. The whole book thirteen, five hundred and twelve characters. The third Jane with “Heng Xian ” words, because of the name. Li zero think it is a complete Taoist books. From the content view, this statement is also true. Because it has been annihilated more than two thousand years, but also not seen in the literature handed down, coupled with profound thinking, so it was first published, that quite popular scholars, then rise the heat of research. Although many studies, differences are also complicated. This disagreement not only contains the text interpretation and bamboo slips, but also involves the interpretation of the essay and the interpretation of the thought. As far as the bamboo slips are concerned, Lian Zuowu currently sees Li Zu, Pang Pu, Gu Shi Kao, Xia Te An, and Cao Feng various programs. Among them, Pang Pu said that astrology