Abstract: In this paper,Linke's turbidity factors for atmosphere ovel Nanking for the five years 1931-1935 are evaluated from the solar intensity records mado at tho Institute of Nanking,which have aPPeared successively in the Monthly Meteorological Bulletin of the Institute The factors PG employed are Feussner and Dubois revised values(1930.) Mean values of the result are tabulatd in tables Ⅰ and Ⅱ.Discussions of which are made with reference to dust number,absolute humidity and upPel air wind condition.