Abstract: Nephrite is generally classified according to colours.While the colours of nephrite are similar and gradient，only deep or light，it is very difficult to be classified exactly.However，dislocated classification of nephrite will affect the value and scientific research.In order to solve this problem，according to the demand of the jade market，with the use of sensory analysis methods and the application of the principles of mathematical statistics，this paper puts forward the lowest thresholds of the standard samples to determine the colours of white nephrite and greenish－white nephrite，which also shows that the technical data from the sensory analysis are reliable and the methods are feasible in the development of national standard sample.