Hu-han Transcriptions and Mandarin;

The phonological rules of the Sanskrit-Chinese phonetic transcriptions of the Dunhuang(敦煌) fragment P.

The materials of Sanskrit-Chinese transliteration can prove that the initials of huiyuan s(慧苑) speech sound were unaspirated and sonant; the initials of Jing(精) and Zhang(章) translated the Sanskrit c-initials simultaneously, and also, the dentals and labiales of Hui Yuan’s(慧苑) speech sound had divided.

Xi Lin s(希麟) materials about the Sanskrit-Chinese transliteration could prove it.

The Yi initial (疑母) of Zhongyuan Yinyun (中原音韵) disappear mostly,and reserve individually,which are identical to the pronunciation condition of the Arabian-Chinese diaphone in Huihui prescription (回回药方).

The article testifies that the zhangxi(章系)、zhixi(知系) and zhuangxi(庄系) of Zbongyuan Yinyun(中原音韵) is syncretic from demonstration and the tone mechanism according to the Arabian-Chinese diaphone in Huihui prescription(回回药方).

This paper inspects the different views of researchers on the entering tone of Zhongyuan Yinyun(中原音韵), and supplements the view that Zhongyuan Yinyun (中原音韵) didn t hawe the entering tone with inspecting comprehensively the entering tone in Arabian-Chinese diaphone literature in Huihui prescription(回回药方).