The changes in form and element composition shape the variation of sunshine factor within urban green spaces. Analyzing such variation and their causes can provide the basis for rationally constructing green plant communities. By using methods such as digital simulation, field testing, and statistical analysis, this study integrates the division of light zones based on sunshine hours and the investigation of shading rates based on light intensity to form six zones of green space sunshine factor, involving 18 spatial types. On this basis, through the investigation of plant growth status under the dominance of the sunshine factor, the suitable range of sunshine for 60 common green plants in Nanjing was summarized. The study delved into the relationship between green spaces and the sunshine factor, offering valuable insights for theoretical and practical research in planting design, habitat creation, and other related fields.