Based on introducing Yabai ruler, to begin with the octal number system, the paper deduces that both geomancer' s nonary ruler and craftsmen's decimal ruler origin from Jiugong system, and describes the philosophical meaning of Yabai ruler from three aspects of Jiugong- feibai, the balance of yin and yang, and five dements of health grams, with a view to provide guidance for studying traditional Chinese buildings and implements design.%在介绍何为压白尺的基础上,以压白尺的进制为切入点,推理出了堪舆师所创九进制尺与匠师所创十进制尺均由九宫术而来,从九宫飞白、阴阳平衡、五行生克三方面阐释了压白尺所蕴含的哲学义理,以期对中国传统建筑、器物设计理论研究等具有指导意义。
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