Abstract: This article introduces the material and energy coupling principle between the 300 000 Nm³/h power plant flue gas carbon capture system and the power plant thermal system. The entire process of material and energy flow in carbon capture systems under typical operating condition is analyzed. The proportion of boiling heat dissipation in the sensible heat of the material flow （45.10%） and the heat of the regeneration process （54.90%）, as well as the proportion of chemical reaction heat （70.14%） and latent heat of vaporization （29.86%） in the heat of the regeneration process, are clarified. Among the five cooling dissipation pathways, the regeneration gas cooler 5 has the highest heat grade （grade 80 ℃）, accounting for 9.13% of the dissipation. The second heat grade （grade 60 ℃）, with the largest proportion of 26.77%, is the lean liquid entering the absorption tower cooler 4. The two can be converted into each other and are the key to waste heat utilization. The influence of only adjusting carbon capture and different factors （rich liquid diversion, lean-rich liquid heat exchange end difference, lean liquid load, absorbent concentration and proportion （MEA: MDEA）, etc.） on cooling dissipation and latent to sensible dissipation ratio （cooler 5 to cooler 4） is studied. Only adjusting the carbon capture rate will not affect the latent to sensible dissipation ratio （0.34）, while the rich liquid diversion can significantly change the latent to sensible dissipation ratio, with a rapid decrease from 0.63 at a rich liquid diversion ratio of 0.05 to 0.11 at 0.2. Reducing the lean-rich liquid heat exchange end difference can quickly increase the latent to sensible dissipation ratio from 0.22 at 12 ℃ end difference to 0.44 at 6 ℃. When the lean liquid load increases from 0.19 to 0.28, the latent to sensible heat dissipation ratio decreases from 0.48 to 0.12. After enhancing the absorbent proportion （0.5−2.0）, the demand for water evaporation during the regeneration process increase, so the latent to sensible heat dissipation ratio significantly increased （rapidly rising from 0.11 to 0.65）.