Abstract: The status and variation of eco-environmental quality in Guangdong during the 13th Five-Year Plan period were analyzed.The results showed that the eco-environmental quality had significant improvement during the 13th Five-Year Plan period.In 2020,the percentage of attainment days in Guangdong was 95.5%,and the concentration of PM_2.5 was 22 μg/m³.Severe acid rain pollution in cities was eliminated.The proportion of surface water meeting Grade Ⅰ-Ⅲ standards was 86.3%,and the area proportion of nearshore seawater meeting Grade I-Ⅱ standards was 89.5%.The natural ecological quality was overall excellent.Compared with those in 2015,the percentage of attainment days in 2020 increased by 1.0 percentage points,and the concentration of PM_2.5 decreased by 29.0%.The pH value of precipitation increased by 0.36 pH units,and the acid rain frequency decreased by 12.9 percentage points.Compared with those in 2016,the proportion of surface water meeting Grade Ⅰ-Ⅲ standards increased by 6.9 percentage points,and the proportion of inferior to Grade Ⅴ standard decreased by 8.5 percentage points.The area proportion of nearshore seawater meeting Grade I-Ⅱ standards increased by 9.1 percentage points.The urban acoustic environmental quality generally remained stable.The natural ecological environment showed a slight improvement.However,the atmospheric O₃ had not yet entered the descending channel,and a few river sections were still heavily polluted.Meanwhile,the foundation of marine ecological environmental management was relatively weak.Challenges were posed in promoting consecutive improvement on the eco-environment quality under the new situation of synergizing the reduction of pollution and carbon emissions.