十五等尺是唐代李淳风以周尺为标准,将东周至隋各种尺分为十五等排列,考证其间尺度的变化。中国尺度的变化,从商代骨尺约合16厘米,至战国厘定为23.1米。经秦、汉沿袭了500多年,至东汉末年似略有增长,至清代定营造尺长32厘米。在2000多年的中国封建社会中,尺度变化最大的是在两晋至隋期间的300多年,又以南北朝时期尺度最为混乱,量值增长也最快:南朝宋氏尺长约24.6厘米,北魏前尺长约25.7厘米,后尺 The fifteenth scale is the Li Chunfeng in the Tang Dynasty with the weekly scale as the standard, the Eastern Zhou Dynasty to the Sui various ruler is divided into fifteen rankings, textual research during the scale changes. The changes in China’s scale, from the Shang Dynasty bone ruler about 16 cm, to the Warring States period of 23.1 meters. After Qin and Han followed more than 500 years to the late Eastern Han dynasty like a slight increase to the Qing Dingding 32 cm long. In the more than 2000 years of Chinese feudal society, the biggest change was in the 300 years between the Jin and Sui periods, the most chaotic scale in the Southern and Northern Dynasties, and the fastest growth in value: the Song Dynasty ruler was about 24.6 centimeters in length and the Northern Wei Qian rui About 25.7 cm long, after the ruler