The isolated-planted trees and colonial-planted trees within the campus green spaces of Huazhong Agricultural University were used to study the spatial heterogeneity of light intensity distribution under trees with different planting dispositions to guide the rational utilization of space under trees in urban city.Gradient measurements of light intensity under trees were conducted in the summer of 2023.The differences in light intensity across different spatial gradients under the two planting dispositions were tested.A non-linear regression equation between light intensity and distance was established to analyze the variation and trend of light intensity with distance under different tree species.The results showed that the light intensity under Osmanthus fragrans was consistently the lowest， while that under the trees including Koelreuteria bipinnata remained at a relatively high level regardless of the isolated-planted trees and colonial-planted trees.The average light intensity under isolated-planted trees was 8 885.36 lx， approximately 1.7 times higher than that under colonial-planted trees.The light intensity under deciduous trees of both planting dispositions was about 1.7 times higher than that of evergreen trees， making it a typical habitat of shade.The ratio of light intensity between the canopy center， canopy edge， and the open （control） point of isolated-planted trees was 1∶1.9∶18.5.In contrast， the ratio for colonial-planted trees among the canopy center， mid-canopy， edge and the control point was 1∶2.07∶5.46∶38.35.The light intensity at the center of the tree crowns can still meet the survival requirements of many shade-tolerant plants.The results of non-linear regression equation between light intensity and distance showed that the decrease in light intensity from the mid-canopy to the center of the cluster was relatively gradual， whereas a sharp decline occurred from the forest edge to the mid-canopy area.It is indicated that the canopy of trees has significant effect of shading on light intensity， and there is a significant gradient difference in light intensity under both isolated-planted trees and colonial-planted trees.