This paper studied the optimal ratio screening experiments were carried out with different concentration and different treatment methods of Qianhu aqueous extract,and the effect of mixed application of 5,000 mg/L of wa-ter extract of Qianhu and 12 kinds of common Chinese herbs on rice blast resistance.The experimental results showed that Soaking the seeds with a mass concentration of 2,500 mg/L and spraying with 5,000 mg/L of the water extract of Qianhu can get a good control effect on rice blast;There were 9 kinds of Chinese herbs interacting with Qianhu,the best inducing effect of the mixture of Qianhu and tangerine peel,although there is a certain gap com-pared with 8％Probenazole,there is no significant difference of the efficacy durability of 8％Probenazole,and the efficacy can last for about 35 days.
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