“发乎情,止乎礼义”是《诗大序》对《诗》三百的基本价值界定之一。关于《诗大序》中所涉及的“情”本思想来源,历来众说纷纭、难有定见。而近年来一些重要考古资料的发现,却为这一问题的解决提供了新的契机。经过对情本思想的溯源和梳理能够发现,《诗大序》中所提出的“发乎情”的观点,其远源来自于思孟学派中的人本思想;而其直接源头,则是孟子对“情”的哲学基础地位的多次强调与认同。这一发现,不仅有助于理清《诗序》的诗学渊源,同时也有助于对先秦两汉时期“情”本思想的重新审视。 One of the basic values ​​defining the three verses of “Shi” is the “distribution of poetry”. As for the origin of the “love” thought involved in the “Poetry Preface”, there are many different opinions and opinions. However, the discovery of some important archaeological materials in recent years has provided new opportunities for the solution of this issue. After tracing the origin and comprehending of the ideal of the sentiment, we can find out that the viewpoint of “making love” put forward in “Preface to the Poem” originates from the thought of humanism in the school of thought of the Semei. Its direct source, It is Mencius’s multiple emphasis and recognition on the philosophical foundation of “love ”. This discovery not only helps to sort out the poetic sources of “Preface to Poetry”, but also helps to re-examine the “love” of Pre-Qin and Han Dynasties.