[Aim] To elucidate photosynthesis-related traits in invasiveness of the invasive plant Flaveria bidentis, we compared the difference in these traits between this invader and a co-occurring dominant native plant Xanthium sibiricum from three different areas in Hebei Province.[Method] Key photosynthesis-related traits, including net photosynthetic rate, transpiration rate and stomatal conductance, were determined in the leaves of F. bidentis and X. sibiricum under different light intensity under field conditions.[Result] The light saturation point (LSP) of the two species from three areas were all higher than 1200 μmol·m^-2·s^-1, and the LSP of F. bidentis was significantly higher than that of native species in Handan and Hengshui by 221.8% and 122.9%, respectively. Moreover, F. bidentis also had a significant lower light compensation point than X. sibiricum in all three areas. As a result, the maximum net photosynthetic (P_nmax) of F. bidentis in three areas was significantly higher than that of X. sibiricum by 42.8%, 221.8%, and 122.9%, respectively. There was no difference in chlorophyll content between invasive and native plants in three areas, and F. bidentis operated lower apparent quantum yield than native species did. The invasive plants generally had higher specific leaf area (SLA), photosynthetic nitrogen use efficiency (PNUE), leaf nitrogen content (N_mass), leaf phosphorus content(P_mass), photosynthetic energy utilization efficiency (PEUE) than the co-occurring native, and significant differences in these traits were detected in Hengshui and Cangzhou. Correlation analysis indicated that the plants P_nmax was positively correlated with blade construction cost (CC_mass), N_mass, P_mass, PEUE and PNUE; leaf SLA was positively correlated with PEUE and PNUE.[Conclusion] Under the same environmental conditions, F. bidentis has higher photosynthetic rate, PEUE and PNUE than native X. sibiricum, potentially contributing to its invasion success in these areas.