Under the environment of global climate change,in order to explore the trend of cyanobacterial bloom in Dianchi in the past ten years and its main influencing factors,this paper uses MODIS remote sensing data and meteorological and environmental monitoring data from 2010-2019,calculates the FAI threshold of Dianchi to be 0.01122 and identifies the bloom,and further analyzes the changes of cyanobacterial bloom in Dianchi under the time series.The results show that Dianchi has cyanobacterial bloom phenomenon in 2010-2019 perennially,and the cyanobacterial bloom phenomenon is more significant in the fall and winter,and even a large-scale outbreak phenomenon with a bloom area share of close to 40% occurs,which can be seen that cyanobacterial bloom in this time period needs more attention and management.Among the meteorological factors affecting Dianchi lake,wind speed,sunshine duration and water temperature have obvious correlation with the bloom.Among them,wind speed and the degree of bloom overall showed obvious negative correlation,and most of the cyanobacterial bloom large-scale outbreaks corresponded to the extreme value of the wind speed in the interval;the sunshine duration also showed obvious negative correlation with the cyanobacterial bloom overall;the water temperature in the fall and the cyanobacterial bloom also had obvious singlepeak relationship with the bloom as a whole,while the other seasons were associated with the sudden change of the water temperature.