本文选取2000,2005,2010,2015和2018年五期的Landsat影像为数据源,反演土地利用与地表温度数据;然后提取热场变异指数、汇源景观贡献度和景观效应指数,分析了海口在城乡梯度上的汇源景观格局对热岛的贡献及其生态效应.结果表明:热岛梯度演变集中于西海岸、中心城区和江东新区;热场变异指数呈“裸地﹥人工表面﹥源景观﹥灌草地﹥农田﹥汇景观﹥林地﹥水体”的规律.在中心城区段,这五期的汇源景观贡献度较大,景观效应指数沿城乡梯度快速递减且促进热岛比例大;郊区段贡献度偏小,景观效应指数波动上升且缓解热岛比例大,存在第二峰值.源、汇景观在中心城区对热岛贡献值最大,沿着梯度方向对热岛贡献度随之降低;越靠近中心城区,值也越大,之后沿城乡梯度逐渐减小.随着城镇不断扩张,在城乡梯度方向汇区比例不断增大、源区比例不断减小,导致了热岛的空间转移与扩散.由此,提出基于区域景观系统理论的热岛缓解策略.“,”The Landsat images of the 2000, 2005, 2010, 2015, 2018 are selected as the data source to retrieve land cover and surface temperature data. The contribution of Sink-Source landscape pattern to the heat island and its ecological effects on urban and rural gradient were analyzed by using Heat Index (HI), Sink and Source Land-scape Contribution (CIsink, CIsource) and Landscape Effect Index (LI) in Haikou. The results show that the heat island is concentrated on the West Coast, and in the central urban and Jiangdong New Area; the HI shows a pattern of decreasing value with the following land types: “Bare land>Artificial surface﹥Source landscape>Shrub grass-land>Farmland>Sink landscape>Woodland>Water body”. In the central city section, the CIsink and CIsource are rela-tively large in these five periods. The LI decreases rapidly along the urban-rural gradient, promoting the Urban Heat Island (UHI) to a large degree. In contrast, the suburban area contributes to a lesser degree. Overall, the LI fluctu-ates, the proportion of mitigating UHI is large, and there is a second peak outside the city center. The existing Source-Sink Landscape contributes the most to UHI in the central urban area, and this contribution decreases along the urban-rural gradient. With the continuous expansion of city-town areas, the proportion of Sink areas has increased along the gradient, and the proportion of Source areas has subsequently declined, resulting in the spatial transfer and diffusion of UHI. Therefore, a UHI mitigation strategy based on the theory of regional landscape sys-tems is proposed here.