Abstract: According to the high NO removal feature of Co(en)³⁺₃, triglycine cobalt was chosen to absorb and catalytically oxidize NO thanks to the similar coordination structures of triglycine cobalt and Co(en)³⁺₃. Ethylene diamine was replaced by glycine to prevent its volatility and difficult transport.It was observed that the NO removal was influenced by the initial concentration of triglycine cobalt, absorption reaction pH value and temperature. The NO removal was enhanced by the rise of triglycine cobalt initial concentration. The optimum pH was neutral or weakly basic. The optimum absorption reaction temperature was 50℃. The addition of urea could increase the ability of triglycine cobalt to simultaneously remove NO and SO2,for urea could accelerate the oxidation of SO^2-₃.