Abstract: Concentrations of heavy metals, including Cu, Pb, Zn, Cr, Ni, and Cd, of plants and sediments samples collected from Zaohe Wetland were determined by ICP-OES. The seasonal change characteristics of heavy metal pollution in wetland system were analyzed, and the principal component analysis and correlation analysis were performed to display the main heavy metal pollutants and the correlation between heavy metals in wetland. The results showed thatthe interception rate of six heavy metals was 48%~78% in July, and 30%~50% in April and October. In the whole wetland system, the distribution of heavy metals in plants and sediments accounted for 5.14%~9.71% and 89.11%~93.35%, respectively, and the loss rate of heavy metals in wetland system was 0.08%~1.78%, which suggested that the sediments play the main role in trapping heavy metals in wetland system. Principal component analysis showed that the contribution rate of principal component of Cu and Zn was 58.78%, while Cr was 18.78%, which indicated that Cu and Zn were the first main pollutant and Cr was the second main pollutant in the Zaohe sewage. Correlation analysis showed that there was a significant positively correlation between Ni and ammonium nitrogen and organic matter (P < 0.05), while a significant negative correlation between Cd and available phosphorus (P < 0.05), indicating that the migration and transformation of Ni and Cd were affected by the physicochemical properties of wetland. The significant positive correlation (P < 0.05) between Cu, Pb, and Zn indicated that the sources of these above heavy metals were consistent, mainly from industrial wastewater. The correlation between Ni and Pb and other heavy metals was not significant, indicating that the source of Ni and Pb was different from others heavy metals in wetlands.