The paper addresses hygroscopic coefficient and wilting point(with barley,H ordeum sativum Jess,as an indicator) and their relations to soil particle<0.01mm content and salt content of saltaf ected soils in Jingdian irrigation zone,Gansu.The results il ustrated that salt content significantly af ected hygroscopic coefficient.In soils with total salts of 7.58~17.39g kg-1 it could reach 17.39%~38.30%(gravimetrically).With decrease in salt content,effect of particle<0.01mm content on hygroscopic coefficient increased.The influence of salt component on hygroscopic coefficient varied in the order of Cl^->Na⁺>Mg²⁺\Ca²⁺>SO₄^2-.It seems that there was no great difference between the effects of particle<0.01mm content and salt content on wilting point,which,however,both reached a significant level.Comparat ively,wilting point was less sensitive to salts content than hygroscopic coef icient was.The effect of salt components on wilting point was similar to that on hygroscopic coefficient.On the correlation of wilting point with hygroscopic coefficient,particle<0.01mm content,salt content and electrical conductivity,three models were presented to predict the wilting point of salt-affected soils in the zone.