Abstract: A DISTR1BUTION KATIO MODEL OF STRONTIUM BY CROWN ETHER EXTRACTION FROM SIMULATED HLLWCHEN JING；WANG QIUPING；WANG JIANCHEN；SONG CHONGLI（Institute of Nuclear Energy Technology，Tsinghua University，P.O.Box 1021，Beijing 102201）ABSTRACT An experiential distrbution ratio mdel for strontium extraction by dicyclohexano-18-crown-6-n-octanol from simulated high-level waste is establised．The experimental points forthe model are designed by experimental homogeneous-design method．The regression of distribu-tion ratio model of strontium is carried out by the complex-optimization method. The model isverified with experimental distribution ratio data in different extraction conditions.The resultsshow that the relative deviations are within ±10％and the mean relative divination is 4．4％be-tween the calculated data and the experimental ones.The experiential model together with an it-eration program can be used for the strontium extraction process calculation,Key words Distribution ratio model Crown ether Strontium Solvent extraction HLLW