Abstract: Making use of measurement data of microclimatic elements of canopy gap in tropical secondary forest in fog-cool and dry-hot season in Xishuangbanna,the daytime characteristics of temporal-spatial distribution and variation of soil surface temperature,air temperature,and leaf temperature of underneath plants in canopy gap were discussed,and relations among them were analyzed. The finding showed that: influenced by fog,solar altitude and trees at the edge of gap,the maximum value of microclimatic elements vvould display at different sites of the gap in different time and season and there existed dynamic displacement of higher value area of leaf temperature. In addition,the direction of heat transferring of soil-plant-atmosphere continuum varied with time and season,even at the same time,the different part of gap had different heat transferring directions. The results vvould supply a research basis for further studying of heat and water vapor transport,microclimatic formation,biodiversity and succession of canopy gap.