[Aim] Bidens alba is a troublesome invasive weed, which has recently invaded farmland, causing serious harm to agricultural production and natural ecosystems in China. In order to select effective herbicides against B. alba, the activity of 13 post-emergence herbicides on B. alba at seedling and adult stages were evaluated.[Method] Herbicides were applied to the plants at seedling (2-3 pairs of leaves) and adult (6-7 pairs of leaves)stages, respectively, with three dosages per herbicide.[Result] The three nonselective herbicides, glyphosate, glufosinate-ammonium and diquat, could completely control (100% mortality rate) B. alba at either growth stages. Among the selective herbicides, dicamba and bromoxynil octanoate could effectively control B. alba at seedling and adult stage. When triclopyr, fluoroglycofen and halosulfuron-methyl were used at high doses, they showed relatively good effecton B. alba at seedling stage, but poor against adult B. alba. Fluroxypyr, lactofen, bentazon, clopyralidand oxyfluorfen showed very poor control effect on both seedling and adult plants.[Conclusion] B. alba had strong tolerance to various herbicides. Growth stage had a great influence on the reaction of B. albato herbicides. The nonselective (glyphosate, glufosinate-ammonium and diquat) and selective herbicides (dicamba and bromoxynil octanoate) were suitable for controlling B. alba.