Abstract: The problem of global warming has being paid attention to increasingly, and the greenhouse gases (GHGs) emissions from the constructed wetlands (CWs) have been concerned, with the widely application of CWs in water treatment. A bibliometric analysis of the related literatures on GHGs emissions from CWs in the Web of Science (WoS) core database was conducted, the key words of 216 research articles were analyzed by clustering, and the progress of main research subjects were summarized. The results showed that: 1) The number of literature on GHGs emissions from constructed wetlands had been increasing since 2003, and the citation frequency of articles also increased. The hot-spot clustering keywords focused on four research directions: the effects of substrate and aeration on greenhouse gases emissions, the effects of plants on greenhouse gases emissions, nitrous oxide (N₂O) production and removal pathways, methane (CH₄) production and removal pathways. 2) The type and configuration of substrates played important roles in the GHGs emissions in CWs. The process of aeration has the potential to alter the internal redox in CWs, thereby impacting the release of GHGs. The presence of plants led to a decrease in the overall GHGs emissions in CWs, while variations in aerenchyma and biomass among different plants resulted in different GHGs emissions. 3) The N₂O in CW was produced by various processes such as nitrification/denitrification, anaerobic ammonia oxidation, nitrate reduction to ammonium, and other pathways. However, denitrification was the unique pathway to remove N₂O. The CH₄ was produced by anaerobic oxidation of organic matter and removed in two paths of aerobic oxidation and anaerobic oxidation. Therefore, an optimized model was proposed to regulate GHGs emissions in CWs by process combination and operation, substrate configuration and plant selection, carbon addition and intermittent aeration. And it was also proposed to further study the conversion mechanism of N₂O and CH₄ in CWs, optimize the regulation of GHGs emissions, and achieve pollution reduction and carbon reduction in CWs in the future.