Abstract: Based on the 2019—2023 water quality monitoring data of the mainstream and tributaries of Huanghe River in Taian City, the water quality status and temporal-spatial trend of Dawen River were analyzed and evaluated. The research results showed that the overall water quality indicators of the mainstream monitoring sections in the river were good, with most sections being Class IV or Class III. In general, the water quality of the mainstream of the river was better than that of the tributaries. The concentration of the upstream monitoring section above Beiwang was relatively low, while the concentration of the monitoring section near Dawenkou in the middle reaches was relatively high. The water quality of the downstream monitoring section near the entrance to Dongping Lake has been greatly improved. Based on the results of research and analysis, combined with the field investigation, the paper put forward the countermeasures of pollution prevention and control, which provided a scientific basis for strengthening the management and protection of water resources in the Yellow River Basin(Tai'an Section).