Abstract: Understanding climatic effect characteristics and influencing factors of urban wetlands assists construction scheme drafting of waterfront city climatic carrying capacity and adaptability optimization. In this study,Landsat-8 OLI/TIRS and high resolution GF-1 satellite images covering 18 typical urban wetland patches in Wuhan，China were collected to retrieve land surface temperature and other parameters during midsummer period of 2013-2020, in order to quantitatively evaluate the cooling effect of urban wetland patches including main river, small rivers, lakes and waterscape parks using cooling range (Lmax), amplitude of temperature drop (△Tmax)，temperature gradient (Gtemp) and area efficiency of cooling intensity（Earea）based on GIS buffer analysis. In addition , potentials impacts of climatic characteristics and synoptic conditions on cooling effect were analyzed using Meiyu precipitation, midsummer extreme high temperature and urban summer dominant wind. The results show below: (1) Different types of urban wetlands have different optimal forms of cooling effect. The main river such as Yangtze River is strongest in Lmax and △Tmax, the lakes are largest in Gtemp, while the small rivers and waterscape parks are largest in Earea. (2)The cooling effect of rivers is mainly determined by their own feathers such as river length and surface water temperature, while the cooling effect of lakes and waterscape parks are mainly determined by the shape index, surface temperature, water and vegetation coverage and surrounded construction land. (3) The disparity of meteorological conditions is one of the most important causes of annual urban wetland cooling effect variances, but it has different influences on different kinds of wetlands and cooling effect indexes. The more precipitation in Meiyu period or higher temperature in midsummer period, the more prominent cooling effects of urban wetlands of the year are. Abundant precipitation and high temperature conditions promote greater improvements in △Tmax，Gtemp and Earea than Lmax and have larger influences on small rivers and waterscape parks than that of major river and lake wetlands. Only rivers that are parallel to the prevailing wind direction have broaden Lmax.