 This paper analyzes the effect of urban heat island on Hong Kong using Landsat TM and AsterData in 2005. Two algorithms were used to retrieve land surface temperature, LST, distribution, and the spatial pattern of LST was analyzed to characterize its local effects on urban heat island. The correlation between LST and Normalized Difference Vegetation Index, NDVI, Normalized Difference Buildup Index, NDVI, was also explored to understand the impacts of green and built-up lands on urban heat island. Results indicate that three suburban areas, namely Kowloon Island, Northern Hong Kong Island, and Hong Kong International Airport, are mainly affected by urban heat island. The negative correlation between LST and NDVI suggests that green land can weaken the effect of urban heat island, while the positive correlation between LST and NDVI means that built-up land can strengthen it. However, in-situ measurements of LST need to be refined with satellite data for future studies. This article was authored by Lin Lu and Yuan Zhijian. We are article.tv, links in the description below.