Abstract: The separation and recovery of technetium from acidic high-level radioactive liquid waste after denitration by formic acid has been studied using'extraction resin carrying tetraamine 7402, which was prepared by means of suspension polymerization at 80℃ of styrene crosslinked with divinyl benzene in the presence of 7402 extractant.The feed, a simulated solution of high level liquid waste from reprocessing of spent fuel, was passed through the column after it had been denitrated by formic acid to a pH value of 2. By means of partial adsorption of technetium on the extraction resin and eluting with nitric acid, decontamination factor fromγ-fission element-Ru, Cs and Ce of 1×105,≥2 XXXXXXXX105,≥1×105 respectively could be obtained after two cycles of operation, and technetium can be recovered quantitatively.The method is simple and easy to operate, and the use of precious Ag-metal could be avoided.The use of extraction resin instead of liquid-liquid extraction also eliminated production of organic liquid waste in the process, thus simplifying waste treatment.