The present paper consists of three parts: 1. Chapter One solves mainly two problems: (A) "Yo Gu Tsung Lieh Ch'(river)”as the principal source of the Yellow River investigated in 1952 was first discovered in 1717. The source of the Yellow River which was drawn in "The Complete Atlas of the Imperial Territory" and described in Ch'i Shao Nan's "The Outlines of the Water Canals" was no other than the same mentioned above and that known by Mongolian terms as Soloma, or Altar Gol, was also the same as the one Albert Tafel inves-tigated in 1707.