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Agricultural informationization is a main trend in agricultural development. Expert system (ES) is a capable assistant during agricultural production. However, now most country areas were not able to use the ES at all, it had influenced and restricted the development of the agricultural informationization seriously. This paper proposed a solution of voice service system of ES, which is suitable for peasant's information transmission, especially the peasants from remote regions could obtain knowledge from ES by the voice service system. Aimed at the disadvantage of massive data of knowledge base and slow deduction, the system adopted the classification method based on decision tree, designed pruning algorithm and cut down the unrelated knowledge to the users in query course, therefore, before the inference engine deduced the knowledge asked by users, the structure of the decision tree had been simplified, so the speed of deduction was accelerated.