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The water quality of Lake Chaohu has improved significantly from the mid⁃1990s to 2012. But in recent years, water quality improvement has slowed down. In particular, cyanobacterial blooms area increased significantly in 2018. In order to evaluate the variation of water environment, we analysed the change characteristics of water quality and cyanobacterial blooms situation in Lake Chaohu using the investigation data covering 17 sites from 2012 to 2018. We also elaborated the progress and shortcomings of water pollution control in Lake Chaohu in the spatial scale of the basin, which will provide support to the modification and confir⁃ mation of pollution control policy. Our results showed that the mean values of total phosphorus concentration, total nitrogen concen⁃ tration and bloom⁃forming cyanobacterial biomass (chlorophyll⁃a and phycocyanin concentration) increased significantly from 2012 to 2018, and the ammonium nitrogen concentration decreased significantly during this period. In spatial, the eutrophication presen⁃ ted slight decreasing trend in the western region, but it significantly increased in the central and eastern regions, especially for the total phosphorus concentration. Even though, the eutrophication level in the western region was still higher than those in the central and eastern regions. The relief of eutrophication was mainly attributed to the decrease in lake⁃inlet pollution from Nanfei River, Shi⁃ wuli⁃Tangxi River, and Paihe River. The increasing lake⁃inlet phosphorus pollution from Zhaohe River ( in the central region), Shuangqiao River and Zhegao River ( in the eastern region) directly contributed to the worsening trend of water quality in the two

The variation of water quality from 2012 to 2018 in Lake Chaohu and the mitigating strategy on cyanobacterial blooms