Abstract: By introducing the waste emission rate X into the IGT equation, this paper established the I_eGTX equation and I_eGT_e equation for quantitatively analyzing the relationship between economic growth and waste emissions. The critical values of annual decreasing ratio of waste emission rate （expressed as x_k） and annual decreasing ratio of waste emission per unit GDP （expressed as t_ek） were given corresponding to the I_eGTX equation and I_eGT_e equation, respectively. SO₂ and COD emissions （not including the Hongkong, Macao and Taiwan area） in the industrial sector as well as total SO₂ and COD emissions in China were analyzed by the I_eGTX equation and I_eGT_e equation, respectively. The following results were obtained: emission rates of industrial SO₂ and COD emissions in China gradually reduced during the period 2000-2006, and SO₂ emissions per unit GDP and COD emissions per unit GDP decreased 61.72% and 71.89%, respectively, from 1997-2008.