[Purposes]This paper studies the characteristics and sources of DOM in various sections of the Tuohe River,as well as the changes between dry and flood seasons,so as to provide reference for solving the pollution problem of the Tuohe River.[Methods]The source and characteristics of dissolved organic matter(DOM)in the Tuohe River in 2022 were analyzed by using UV-VI spectroscopy,the temporal and spatial differences of DOM components and the influencing factors in the dry season and flood season were also discussed,and the DOM of Tuohe River has obvious urban load.[Findings]The results showed that the DOM content in June was higher than that in January in the dry season.The DOM con-tent in the Tuohe Rriver increased obviously after it passed through Yongqiao,Suzhou,and the DOM of Tuo River has obvious urban load.[Conclusions]The general trend of change is similar from the upper reaches to the middle reaches of Tuohe River,which leads to the increase of DOM content.DOM compo-sition and content of Tuohe River in Yongqiao district of Suzhou changed obviously in the post-flood sea-son,and the load in different months was different.
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