Disentangling the long-term effects of multidimensional diversity that determine variation in species' invasion success is of great importance in understanding diversity-invasibility paradox to both basic ecology and conservation efforts. Considering four primary components of diversity and taxonomic, functional and phylogenetic diversity, this study examined inter- and intra-annual relationship from 2011 to 2019 between native plant diversity and alien plant invasion of a riparian wetland in northeastern China. Results showed that functional diversity had the strongest correlations with alien plant invasion, and maximum life span played the key role in resisting invasion. Moreover, dominance was the best in explaining the variation in alien species invasion, and phylogenetic richness showed more correlations with alien species invasion than species richness. As for the intra-annual variation, effects of taxonomic dominance increases and other components decreases significantly in the 9 consecutive years. Thus, dominant species, functional traits and phylogenetic richness should be given priority in managing alien plants invasion in wetland conservation.