By a comprehensive introduction to the bronze sculpture of the Northern Wei Dynasty housed in The Museum of Zhenyuan County Gansu Province and its presentation motif of Sakyamuni、Sakyamuni sit together with Prabhūtaratna、cross-legged Maitreya and the composition of the Thousand Buddhas, this article is intend to analysis the date and the source of creation of the composition. A conclusion is drawn by above analysis that the composition as a type of arrangement were prevailed at the 5th-6th century during the Sixteen Kingdom period. The earliest evidence were found in Cave 148 at Bingling Temple-Cave, then the type of arrangement were introduced to the Yonggang Grottoes and other Buddhist Temple-Cave sites along the Hexi Corridor and Longdong Area in Gansu Province
