This paper studied acquisition of image data of maize diseases using Web service method,which is a kind of mobile internet technique, using the mobile terminal as the main tool for disease information collection, identify maize disease by using SVM（support vector machine） classification method in server,then return the recognition results to the mobile terminal in real time. It improves the efficiency of agricultural producers and technical staff. At the same time, SVM classification still has good generalization ability with small training samples. In the experiment, SVM parameters were adjusted. Experimental results showed that this method is more suitable to the identification of maize diseases.