The Silla Stone-sutras hand down to us by many broken pieces. There are actually three different Stone-sutras, namely Hwaeom Stone-stura, Bubhwa Stone-stura and Kumgang Stone-sutra As I studied three Stone-sutras, I came to the conclusion that these are Carved around ninth century at late Silla between king Mun-Sung and king Hyen-Gang, because there are many noted calligraphers and sculptors of late Silla period left us these Stone-sutras and zen Master's stone slabs.