Abstract: The sportion behaviors of technetium on pyrrhotine are studied with batch experiment and dilute sulfuric acid is used to dissolve the technetium adsorbed on pyrrhotine.Sorption and desorption experiment are performed under aerobic and anaerobic conditions (inert gas box).The results show that a significant sorption of technetium on pyrrhotine is found under aerobic and anaerobic conditions,and the sorption on the mineral is supposed to be due to the reduction of TcO 4 - to insoluble TcO 2· n H 2O.Desorption process of the sorbed technetium into dilute sulfuric acid is found to be different under aerobic and anaerobic conditions.On addition of H 2O 2 to the leach solution a sudden increase of the technetium concentration is observed.