Invasive plants potentially threaten urban ecosystems, which deserve more attention. This paper took invasive plants Bidens pilosa and Sphagneticola trilobata as a case study, to explore urban invasive plants’ influence on species and functional diversity of herbaceous plants. Different levels of independent and joint invasion effects on herbaceous community’s species diversity and functional diversity were analyzed. The results showed: (1) Margalef species richness index, Shannon-Wiener diversity index, Simpson dominance index, and Pielou evenness index exhibited a significantly negative correlation with invasive plants’ coverage (p<0.05, 0.5865