三分损益律是我国古代正统律制。目前所能见到明确用三分损益法阐述这一律制的最早文献当数《管子》。《管子·地员篇》载文:凡将起五音,凡首,主一而三之,四开以合九九,以是生黄钟小素之首,以成宫;三分而益之以一,为百有八,为徵;不无有三分 The one-third loss and gain law is the ancient orthodox system in our country. At present, we can see the earliest documents titled “Guan Zi”, which clearly state this system of law by using the three-point profit and loss method. “Pipe member” article: Where will be five tones, where the first, the Lord one and three, four open to nine nine, so born yellow bell of the first, with Palace; third and benefit to one , For the hundred and eight, for the levy; not without a third