在全球变暖和城市化快速发展的背景下，城市热环境广受关注。本文基于局地气候分区（Local Climate Zone, LCZ）体系，利用Landsat影像反演地表温度，从类间、类内两个视角研究了南京市主城区夏季热环境动态变化特征。结果表明：(1)LCZ类间热环境表现出较大差异，较高的建筑密度表现出较高的平均地表温度，随着建筑高度的下降平均地表温度逐渐升高。并且，大型低层建筑（LCZ 8）在夏季一直呈现出较高的平均地表温度；(2)各建筑类型平均地表温度高于研究区整体平均地表温度，各自然地表覆盖类型除裸土或沙地（LCZ F）外，平均地表温度表现低于研究区整体平均地表温度；(3)LCZ类内热环境分析结果表明，密集型中层建筑（LCZ 2）、密集型低层建筑（LCZ 3）、重工业区（LCZ 10）和裸土或沙地（LCZ F）对温度变化表现出较大的敏感性。

The issue of global warming has become increasingly prevalent in recent years. Concurrently, there is a considerable prevalence of extreme meteorological occurrences in urban environment, exemplified by the intense heat that characterizes the summer season. The urban heat environment has become a research focus under the background of global warming and rapid urbanization. At present, Local Climate Zone (LCZ) represents the principal method of classification employed in the field of urban thermal environment research. In comparison with the traditional urban-rural dichotomy, this approach entails a further subdivision of the city on the basis of the physical characteristics of the buildings and the natural ground cover features. Based on the Local Climate Zone (LCZ) system, this paper investigated the summer thermal environment characteristics of the main urban area of Nanjing from two perspectives: interclass and intraclass, using Landsat image inversion of surface temperature. The classification of local climate zones divided the study area into 12 categories, of which 8 were designated for building types and 4 were designated for surface cover types. The proportion of building types within the study area was greater than that of ground cover types. The building types exhibited a high proportion of open high-rise (LCZ 4) and dense mid-rise (LCZ 2), which were predominantly concentrated in the central urban areas. The largest surface cover type was bare soil and sand (LCZ F). The result found that, firstly, the thermal environments among LCZ classes showed large differences. Higher building densities had higher mean LSTs. The mean LSTs tend to rise gradually as building height decreased. The time-series trend of mean temperature for the various LCZ types was highly consistent with the overall mean temperature trend observed in the study area. Besides, Large low-rise (LCZ 8) consistently presented high average surface temperatures during the summer months, reaching a maximum of 53.2 degrees Celsius; Second, the average surface temperature for each building type was higher than the average surface temperature for the study area as a whole, and the average surface temperature for each natural ground cover type except bare soil or sand was lower than the average surface temperature for the study area as a whole. The mean surface temperature of compact mid-rise (LCZ 2), compact low-rise (LCZ 3), large low-rise (LCZ 8), and heavy industry (LCZ 10) were higher than the overall mean temperature of the study area. Furthermore, this study presented intraclass analysis of different LCZ types using relative rates of change in LST. An increased sensitivity to temperature fluctuations may have adverse effects on human well-being and economic productivity. Another important finding was that, the intra-LCZ thermal environment analyses indicate that there is a heightened sensitivity to temperature fluctuations in the following categories: compact mid-rise (LCZ 2), compact low-rise (LCZ 3), heavy industry (LCZ 10), bare soil and sand (LCZ F). The findings of this study can serve as a valuable reference point and provide insights for further research in the fields of urban planning, the mitigation of the urban heat island effect, and the enhancement of the urban heat environment.