Abstract: Based on 237 distribution points and 19 climatic factors, the potential distribution of Bidens frondosa was predicted under three climate scenarios (RCP2.6, RCP4.5, and RCP8.5 (RCP: representative concentration pathways)) in current and future (2050s and 2070s) in China. The results showed that: (1) The main environmental factors affecting the distribution of B. frondosa were the precipitation of warmest quarter and the seasonal variation of temperature. (2) Under current climate mode, the suitable distribution area was 3501205 km², accounting for 36.32% of the total land area in China. Except for Xinjiang, Qinghai, and Hainan provinces, other provinces (cities) are covered. (3) Under the future climate mode, the suitable distribution area increased by 107200-981500 km² under the three scenarios, and reached the maximum (4482700 km²) in the RCP8.5 scenario in 2070s, and the suitable distribution area spread to the northeast of Inner Mongolia. In conclusion, under the background of global climate change, the suitable area of B. frondosa in China will increase and expand northward.

Key words: Bidens frondosa, MaxEnt model, suitable distribution area, climate change.