【Aim】 Several studies have shown that alien invasive plants have serious negative impacts on biodiversity, especially on native species that compete for similar resources. Global nitrogen (N) deposition can increase soil N availability, which may favor fast-growing invasive plants. However, whether invasive plants are superior to their native congeners, and whether the competitive relationship between them will be altered with increased N deposition remain unclear. Understanding these questions will help to predict alien plant invasion risks and protect native biodiversity under N deposition. 【Method】 We conducted a greenhouse experiment, in which invasive species Bidens pilosa and its native congener B. biternata were grown alone and together under three N addition treatments (CK: 0 g·m^-2·a^-1, low N addition: 1 g·m^-2·a^-1 and high N addition: 5 g·m^-2·a^-1). We compared the growth (plant height, branch number, root/shoot ratio and biomass) and competition parameters of the invasive species and its native congener. 【Result】 High level N addition significantly increased the biomass and decreased the root/shoot ratio of invasive B. pilosa regardless of whether it was grown alone or grown together with B. biternata, and also enhanced the plant height and branch number of B. pilosa when grown alone. But high level N addition only enhanced the biomass of native B. biternata when grown alone. The RDI and RII of B. pilosa were greater than that of B. biternata under all N treatments. Furthermore, high level N addition significantly increased the RDI of B. pilosa whereas reduced the RDI and RII of the native congener. The RII of B. pilosa did not significantly differ among N treatments.【Conclusion】 High level N is more favorable for the growth of B. pilosa than for that of B. biternata. The invasive species exhibit stronger competitive ability and more tolerance than its native congener under all N treatments, and the competitive ability was magnified under high N level. Global N deposition may exacerbate the competition inhibition of B. pilosa over its native congener and hence increase its invasion risk.