The dynamics of soil inorganic nitrogen and the growth status of rice under different tillage methods werestudied，which could provide scientific basis for soil fertility for ratoonrice.According to whether paddy field was plowed during fallowbefore winter or not and the condition of rotary tillage before transplanting，four tillage methods were setup，which includedplowing once and rotary tillageonce(T1)，plowing once and rotary tillage 2times(T2)，no plowing and rotary tillage 2times(T3)，and no plowing and rotary tillage 3times(T4).The dynamic soil inorganic nitrogen and rice growth of thesetreatments werestudied.The result showedthat:in the main growth period ofrice，the soil inorganic nitrogencontent，plantdry matter accumulation and rice yield showed a trend of T2>T1>T4>T3 under different tillagetreatments，and the effect ofplowing combined with rotary tillage was better than rotary tillageonly.Thus，plowing once and rotary tillage 2times(T2)can increase soil inorganic nitrogensupply，promote ricegrowth，and enhance dry matter accumulation and rice yield. Hence，it is worthy of recommendation in early rice and ratoon rice production.