From July 25 to September 20, 2018, five typical herbicides and two adjuvants were used to control Solidago canadensis L. in Guogongdu, Changsha county, where the outbreak occurred in the middle and late stage. The results showed that when S.canadensis was cut to leave 10 cm stubble for 23 d, glyphosate-isopropylammonium 41% AS 1 097.40 g/hm~2+organosilicon 600.00 g/hm~2, triclopyr-butotyl 48% EC 900.48 g/hm~2+glufosinate ammonium 20% AS 489.60 g/hm~2 and hexazinone 25% SL 687.50 g/hm~2+glufosinate ammonium 20% AS 629.40 g/hm~2 demonstrated the best control efficacy. When 20 cm stubble was ret...