The second layer of the archaeological stratum remains on the site of the nine-storied woodenstructure in front of Cave 98 (also known as the Northern Great Image) are not belong to the WesternXia Dynasty , it was the remains of the Song renovation project for the front building of the NorthernGreat Image which were presided over by Cao Yuan-zhong and his wife in 966 A.D. The four sculp-tures of the Heavenly-Kings should be there two each on the flank of the northern great image of Bud-dha inside the building on the west gate which were built original as the Buddha's image dating fromthe Tang Dynasty and The Song Dynasty.