A method for controlling a CO 2 chemical absorption system comprising a CO 2 chemical absorption equipment and an absorbent regeneration equipment, the method comprising: (a)removing sulfur oxides in an exhaust gas discharged from a combustion equipment of fossil fuel by a flue gas desulfurization device to obtain a desulfurized exhaust gas containing carbon dioxide (CO 2), (b) contacting an amine absorbent with the desulfurized exhaust gas containing CO 2 in a CO 2 absorber column to absorb the CO 2 into the amine absorbent and obtain a CO 2 -absorbed amine absorbent, (c) heating the CO 2 -absorbed amine absorbent in a CO 2 desorber column to release the CO 2 from the CO 2 -absorbed amine absorbent and obtain a CO 2 -released amine adsorbent, (d) cooling the CO 2 released from the CO 2 -absorbed amine absorbent to separate a condensed water, (e) circulating the condensed water to the CO 2 desorber column, (f) heating the CO 2 -released amine absorbent through a reboiler for circulation in the CO 2 desorber column, (g) heat exchanging the CO 2 -released amine absorbent withdrawn from the CO 2 desorber column with the CO 2 -absorbed amine absorbent to be supplied to the CO 2 desorber column for circulation in the CO 2 desorber column, (h)withdrawing the CO 2 -released amine absorbent from the CO 2 desorber column to a reclaimer of the absorbent regeneration equipment, (i) rerouting some of the condensed water to an adjustment tank of the absorbent regeneration equipment, (j) preparing an inorganic alkali salt solution using the condensed water in the adjustment tank, (k) adding the inorganic alkali salt solution to the CO 2 -released amine absorbent withdrawn from the CO 2 desorber column, removing heat stable salts accumulated in the CO 2 -released amine absorbent by a distillation process in the reclaimer, (m) supplying vapor of the CO 2 -released amine absorbent resulting from the distillation process from the reclaimer to the CO 2 desorber column. (a)removing sulfur oxides in an exhaust gas discharged from a combustion equipment of fossil fuel by a flue gas desulfurization device to obtain a desulfurized exhaust gas containing carbon dioxide (CO 2), (b) contacting an amine absorbent with the desulfurized exhaust gas containing CO 2 in a CO 2 absorber column to absorb the CO 2 into the amine absorbent and obtain a CO 2 -absorbed amine absorbent, (c) heating the CO 2 -absorbed amine absorbent in a CO 2 desorber column to release the CO 2 from the CO 2 -absorbed amine absorbent and obtain a CO 2 -released amine adsorbent, (d) cooling the CO 2 released from the CO 2 -absorbed amine absorbent to separate a condensed water, (e) circulating the condensed water to the CO 2 desorber column, (f) heating the CO 2 -released amine absorbent through a reboiler for circulation in the CO 2 desorber column, (g) heat exchanging the CO 2 -released amine absorbent withdrawn from the CO 2 desorber column with the CO 2 -absorbed amine absorbent to be supplied to the CO 2 desorber column for circulation in the CO 2 desorber column, (h)withdrawing the CO 2 -released amine absorbent from the CO 2 desorber column to a reclaimer of the absorbent regeneration equipment, (i) rerouting some of the condensed water to an adjustment tank of the absorbent regeneration equipment, (j) preparing an inorganic alkali salt solution using the condensed water in the adjustment tank, (k) adding the inorganic alkali salt solution to the CO 2 -released amine absorbent withdrawn from the CO 2 desorber column, removing heat stable salts accumulated in the CO 2 -released amine absorbent by a distillation process in the reclaimer, (m) supplying vapor of the CO 2 -released amine absorbent resulting from the distillation process from the reclaimer to the CO 2 desorber column.