Tests showed that under all maize straw returning conditions, the after seedlings herbicide nicosulfu-ron or BAS 670 H, mixing with Flumetsulam or Mesotrione and Atrazine or Bromoxynil could control corn fieldweeds effectively. Its control effects after 45 days were 90.73%~95.30%. It also has yield increasing function, andmaize yield increased by 23.92%~28.60%.