用三分损益法确定的律制,叫三分损益律。我国三分损益法最早的记载为《管子》。《吕氏春秋》中的乐律也明确为三分损益律。此后三分损益法便见于历代的乐律研究,成为古代的正统律制。 三分损益的方法乃是三分损一法同三分益一法的结合。三分损一,是将振动体分成三等分,损其一分生成该音的上方五度音;三分益一乃是三分增益一分,生成该音的下方纯四度。三分益一,实乃是三分损一以后的移低一组。但是计算三分损益律时,何时该损、何时该益,当计算某一律时该损 The law determined by one-third of the profit and loss method is called the one-third loss and gain law. The earliest record of China’s one-third loss and gain method is “pipe”. “Lu’s Spring and Autumn” in the music law is also clear for the third loss and gain. Since then, the third-quarter profit and loss law will be found in the study of the music of all ages, becoming the ancient orthodox system. One-third of the method of gain and loss is a combination of one-third with one-third method. One-third loss, the vibration body is divided into three equal parts, loss of one point to generate the top five-tone sound; one-third one-third gain is a point, to generate the tone below the pure four degrees. One-third, real but one-third after the lower one. However, when calculating the three-point loss of benefit law, when the loss, when the benefit, when calculating a law of the loss