Abstract：Based on intensively analysis of 84 tones old maps set by CAI Yuanding and Zhu Zaiyu's new maps,the author interprets Cai Yuanding's 6 laws of change and Zhu Zaiyu's tune changes.After comparing two maps by means of modern audio score,whole step and relative wavelength interval coefficient,the author analyzes Zhu Zaiyu's no change on the change in the law of the 12th Sound intuitively and clearly.

Keyword：sound change;tune change;intermediate partial tone;