Abstract: The main diseases of Tomato in Hetao area has stem rot, seedling blight, early blight, late blightmore, and so on, The occurrence of tomato diseases caused by its yield and quality decline, seriously affect the economic benefits. So, the main diseases of tomato symptoms and occurrence conditions to be elaborated, And put forward the corresponding countermeasures in order to provide reference for the prevention and control of Tomato Diseases.