Abstract: A platform for observing the solar radiation characteristics of vertical greening canopies was established with plants commonly used in subtropical regions. The model of canopy solar radiation transmittance based on the Lambert-Beer law was modified.The performance of the modified model was examined using error analysis indicators. Through a sensitivity analysis of the input parameters,it was found that the leaf area index（LAI）is a critical parameter affecting the canopy solar radiation transmittance.Therefore,the annual variations of the LAIs of the plants were observed. Then,the solar radiation transmittances of canopies with different orientations were determined using the modified model. The results indicated that the vertical greening canopies intercept over80% of incident solar radiation.