Sōsyu new Great Buddha’s all the Buddhist sutras（相州新大仏一切経）were dedicated
to the Kamakura Great Buddha.
They were written in 1250 and 1251.
The purpose of this paper is to clarify those original texts.
My research has led to a conclusion that those original texts were the Song-dynasty Sixi Edition of the Buddhist Canon（宋版一切経思渓版）.
In this report, I found out the following things, too.
１． The Song-dynasty Kaiyuan temple Edition of the Buddhist Canon（宋版一切経開元寺版） modifies the Song-dynasty Tongchan temple Edition of the Buddhist Canon（宋版一切
経東禅寺版）.
２． The Song-dynasty Sixi Edition of the Buddhist Canon（宋版一切経思渓版）is based on the Song-dynasty Tongchan temple Edition of the Buddhist Canon（宋版一切経東禅寺版） not the Song-dynasty Kaiyuan temple Edition of the Buddhist Canon（宋版一切経開元寺版）.
３． The glossaries（音釈）of the Song-dynasty Kaiyuan temple Edition of the Buddhist Canon（宋版一切経開元寺版） omits that of the Song-dynasty Tongchan temple Edition of the Buddhist Canon（宋版一切経東禅寺版）