Much attention has been paid to and some studies have been made on oscillation andnonlinear dynamics of chemical reaction.Some oscillation cases in geochemical reactionsystems have been reported.Through the dissolution kinetic experiment of chalcopyrite,the authors have found that dissolution reaction of chalcopyrite in NaCl solution of weak tointermediate acidity is a nonlinear reaction and that concentration of Cu in solution showsoscillatory and non-periodical changes during the reaction. Much attention has been paid to and some studies have been made on oscillation and nonlinear dynamics of chemical reaction. Some oscillation cases in geochemical reactionsystems have been reported. Through the dissolution kinetic experiment of chalcopyrite, the authors have found that dissolution reaction of chalcopyrite in NaCl solution of weak to intermediate acidity is a nonlinear reaction and that concentration of Cu in solution showsoscillatory and non-periodical changes during the reaction.