Abstract: By the collection and study of the prescription masterpiece Arcane Essentials from the Imperial Library in Tang Dynasty， this research aims at discussing the recording characteristics and thoughts of this book and considers that there hides large amount of anonymous prescriptions in prescription literatures， which are not only reflecting the traditional and plain thoughts of previous doctors， more important things are the crystallization of both authentic records and clinical experience collected from clinical doctors treating and drug-using. This is an abundant resource which is worth studying and developing for utilizing.