Abstract: Abstract: Field experiment was conducted to study effects of different tillage methods on weed dynamics and weeds control efficiency of nicosulfuron spraying in 2-4 leaf stage of weed and yield of corn in wheat-maize double cropping system. The results showed that weed communities had little different in different tillage methods. The numbers of weed reduced 53%-82% comparing with the plot of wheat stalk-covering and no tillage, and reduced 62%-78% comparing with the plot of wheat stalk-covering and rotary tillage. At the rate of 30g/hm2 of nicosulfuron weeds control efficiency in wheat stalk-covering was the best in three tillage methods. The emergence percentage of corn were lower in wheat stalk-covering than that in no tillage and rotary tillage, but it’s seeds per ear , 100-seeds weight and the yield of corn were higher. At the rate of 45-60g/hm2, the yield of corn had little different in different tillage methods. At the rate of 30g/hm2 of nicosulfuron and CK, the yield of corn in wheat stalk-covering was the highest in different tillage methods.