336 g/L BAS67001H,a new herbicide applied to maize field,was developed by BAS Company in Germany.Its controlling effect to weeds in maize field and its safety was studied in this experiment.The results showed that application of 336 g/L BAS67001H at 25.2~30.24 g/hectare when maize seedling was 2 to 8 leaves achieved controlling effect of 86.6%~90.8% after 45 days.And it was better when 15.12~20.16 g/hectare BAS67001H was applied with atrazine at 570 g/ hectare.It was safe to maize growth.The yield of maize increased 6~12% than manual weeding.