北宋时期乐律理论和乐器制度发展经历了一个波折较多的历史过程。本文分析了北宋乐律理论和制度的发展,以大晟乐的成功推行为例分析了其在北宋朝廷政治气象中的活跃表现。 Northern Song Dynasty musical theory and instrumental system experienced a twists and turns of the historical process. This paper analyzes the development of the theory and system of musical law in the Northern Song Dynasty, and analyzes the active performance of the theory in the political climate of the Northern Song Dynasty courted by the successful implementation of Dasheng Music.