This article studies of the mural-painting of the Pilgrimage journey to West found in the hall of reclining Buddha at Dafosi(The Great Buddha Monastery) Zhangye Gansu by making a comparison with the style and composition of engraving illustrations of A Critics Writings on the Pilgrimage journey to West by LI Zhuowu which were printed in the Ming Dynasty.The similarities between the wall-painting and the illustrations of Mr.LI Zhuowu Pi Ping Xi You Ji(A Critics Writings on the Pilgrimage journey to West by LI Zhuowu) had provided much useful details of the wall-painting content.Based a comparison study,this article goes on discussing the date of execution of the wall-paintings at The Great Buddha Monastery in Zhangye Gansu.