Abstract: Field experiment was conducted to study effects of continuous no-till on corn field weed community succession and maize yield in wheat-maize double cropping system; weed species and quantity in corn field with different tillage methods were investigated using the method of inverted W- pattern with 9 sampling points; weed fresh weight was weighed using bioassay method and yield was weighed after corn maturity. The results showed that weed species in no-till covering wheat straw and no-till corn field had increased from 12 to 13, and there was no change of weed population constitution in rotary tillage corn field, which had 11 kinds of weeds. The cornfield weed number in No-till field covering wheat straw for 1-5 years was less than that of rotary plow, for 6-7 years, there was little difference between two kinds of farming. Compared with the rotary plow, weed number in No-till corn field for 1-4 years ebb and flow with each other, weed number had been more than that of rotary plow from the 5th year. No-till covering wheat straw significantly reduced proportion of Eleusine indica, while the proportion of Digitaria sanguinalis increased. Maize yield decreased after No-till for 3 consecutive years, yield decreased slower in no-till field covering wheat straw than that in No-till field. Notill covering wheat straw could reduce the amount of corn field weed, and the inhibition effect declined with the extension of no-till time. The longer of the no-till time of corn field, the more serious of weed.