The vegetation hotspot dependence on its stucture at various times in one day and various growth periods is investigated in this paper. We simulate the interaction of light and vegetation based on three dimensional plant canopies.Our approach consists of four processes. Firstly

the biophysical parameters

such as corn plant height

leaf base height

size of leaf

and shape of leaf

are measured on field

and the statistics of the parameters is obtained based on the measurement. Secondly

the three dimensional structure of canopy is built by the CSM （Computer Scene Model）according to the statistics under a pixel configuration

such as planting by row or by random. Thirdly

the zenith and azimuth of sun are calculated for the simulated site on earth. Fourthly

hotspots and bi directional reflectance distribution functions are calculated by the LIM （Light Interception Model）under various sun and viewing geometric conditions. Finally we evaluate diurnal consecutive hotspot and seasonal consecutive hotspot. The characteristic and scientific objectives of hotspot satellite Triana also are introduced. The simulated result will improve our understanding about the Triana data

and help us to use the dada effectively.