Abstract: Based on the data of Yueyang National Climate Observatory, the diurnal and seasonal variations of land and lake winds along the east coast of East Dongting Lake from June 2017 to May 2019 were analyzed. Based on the data of Linxiang, Huarong national meteorological station, regional meteorological station, the temporal and spatial four-dimensional variation characteristics of temperature, land-lake breeze and relative humidity in Dongting Lake from 4 to 23 August 2017 were analyzed. The results show that: the lake-land breeze at Yueyang Station alternates day and night, with the strongest in summer and the weakest in winter. The lake wind is positively correlated with the warm and wet air currents , while the urban heat island is positively correlated with the land-lake breeze. Reflecting sunlight from the lake surface causes the air to warm up in a certain area near the lake. In the daytime, especially at noon, the lake surface temperature decreases greatly with the altitude. At night, the inversion layer appears. Yueyang urban heat island effect is obvious, especially around the evening. There are obvious actual lake-land breezes in the northeast and diurnal periodic variations of wind speed in the southwest. There is a superposition effect between lake-land breeze and urban heat island and valley breeze. Close water, hills, buildings, trees and vegetation have obvious effects on wind, temperature and humidity of the station. The actual lake-land breeze increases first and then decreases with the height, and obvious lake-land breeze still exists at the height of 200 m. The relative humidity of the lake center decreases obviously with altitude. The Lake breeze makes the air humidity of Yueyang station increase significantly, and the urban land breeze makes the lake center humidity decrease significantly.