【Objective】 Plant landscapes are an important component of urban green spaces, where color is a notable ornamental feature; color is also an important index, directly affecting the quality of the plant landscape. The study of color in this context provides new ideas to explore the intrinsic attributes of color in urban parks and new ideas for the study of plant configurations. 【Method】 This study used 26 typical plant combinations in seven urban parks (i.e., Harbin Guliyuan, Middle East Railway, Zhaolin, Sports, Qunli Clove, Taiping and Qingbin parks), as research objects. ColorImpact color-assisted software was utilized to extract the characteristic attributes of each plant combination color. The beauty evaluation method was used to evaluate the combination color of plants in Harbin City Park, and the relationship between the plant color influence index and landscape aesthetic quality was analyzed. The results show that the aesthetic quality of the plant landscape in Harbin City Park may be divided into five grades (i.e., Ⅰ, Ⅱ, Ⅲ, Ⅳ, and Ⅴ), where the scenic beauty values were concentrated in grade Ⅲ. This demonstrates that the color quality of the plant landscape in Harbin City Park was at a general level. Regression analysis of color quantification index and scene beauty was carried out to establish a mathematical regression model of plant color beauty evaluation for Harbin City Park. The model was used to obtain the factors influencing the color and scenic beauty degree for differing plant combinations in Harbin City Park; these factors included the hue index (H), the number of colors (X_NC), the main color ratio (X_MHi) and the cold and warm color ratio (X_THi). The landscape evaluation model was:${{X}_{\text{SBE}}}=-1.296-0.364\bar{H}+1.695{{X}_{\text{NC}}}+0.969{{X}_{\text{M}{{\text{H}}_{i}}}}+0.821{{X}_{\text{T}{{\text{H}}_{i}}}}$. 【Conclusion】 By extracting quantitative plant color characteristics, analyzing the correlation between plant color factors (color ratio, main color ratio, adjacent color ratio, complementary color ratio, cold and temperature ratio, color diversity index, color uniformity index, saturation ratio, lightness proportion and background proportion) and public aesthetics, this study can provide a reference for the improvement of plant community color configurations and the construction of plant landscapes.