Abstract: REMOVAL OF Cs FROM HIGH LEVEL RADIOACTIVE LIQUID WASTE WITH POTASSIUM TITANIUM HEXACYANOFERRATEJIANG CHANGYIN；WANG SHIZHU；SONG CHONGLI；SUN YONGXIA；WANG QIUPING；XUSHIPING（Institute of Nuclear Energy Technology,Tsinghua University,P.O.Box 1021 ，Beijing 102201）ABSTRACT Spherical potassium titanium hexacyanoferrate has been synthesized by sol-gel method as aninorganic ion exchanger. Its ion exchange properties for Cs are studied．The experimental resultsshow that this material behaves good mechanical stability，excellent hydrodynamic characteristicin an ion exchange column and very high selectivity for Cs. In a simutated acidic high level ra-dioactive liquid waste（HLLW）solution comtaining 450g／l of various nitrares，the static exchangecapacity for Cs is about 1．0mmol／g，and the dynamic exchange capacity tested in column processis about 0．81mmol／g.Key words Potassium titanium hexacyanoferrate Inorganic ion exchanger HLLW Cs