Livestock breeding farms usually distribute in remote areas, with relatively poor condition of disease diagnosis. Generally, it is hard to carry out disease diagnosis rapidly and accurately. But the farms can diagnose animal disease quickly and accurately by the animal disease diagnoses expert system. It could ensure a sound development of the stockbreeding industry. This paper proved the practicality of support vector machine (SVM) which is used in the animal disease diagnoses expert system in theory by studying the disease diagnosis expert system based on SVM. And the experiments proved that SVM can make the disease diagnose accurately.