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This paper through explaining the theory of solar radiation energy, plant spectroscopy, ecology, and vegetation remotely sensed, these transdisciplinaries, to identify the vegetation cooling effect mechanism, is aimed to eliminate disagreement in this field. In this paper we propose vegetation stress monitoring, through investigating in urban greening's health state management, improving vegetation ecology service function should be a new research point. Urban vegetation has numerous ecology services function, especially important for mitigating urban heat island effect in summertime. Recently a lot of research study on the correlation between vegetation cover and urban heat island, based on extracting information from remote sensing data, however most of the study ignored about the real mechanism of vegetation cooling temperature.