The results of experiments showed that the best consistency of resistance on blast of rice induced with β-Aminobutyric Acid was combined 1% seed soakage with 1000μg/ml foliar spray.β-Aminobutyric Acid application included seed soakage and foliar spray,the optimum concentration was 1% and 1000μg/ml,separately.The effect varied with rice varieties,and induced resistance was better if the disease resistance of variety was worse.