[Collation and research on the different texts in Qian jin yao fang (Precious essential formulary, PEF)].

There is considerable difference in the texts between PEF and the archaic editions Sun zhen ren qian jin fang (The Immortal Sun's Precious Formulary, ISPF) and the Song - revised edition Bei ji qian jin yao fang (Precious Essential Formulary for Emergency, PEFE). It is hoped that the real features of PEF can be worked out through collated studies on these two editions so as to offer a basis for systematic research on PEF. At the same time, it has been proved that during the revision and collation of PEF by the Song scholars, it is certain that dramatic revisions had been made on its medical materials, especially an abundant amount of medical materials were added. As a result, the current circulated edition of PEFE does have obvious differences with Sun's original work, while ISPF, in contrast, preserves the original features of Sun Simiao. Hence, ISPF is of important academic significance in the in - depth study of PEF.