The operation, of sorting and the arrival of potatoes, is still on low mechanization degree and involves heavy laboring intensity. however, there is little research on optimizing the devices of conveyor line interiorly. Based on a reference to some foreign research results about the conveyor line with the function of sorting potatoes by sizes, this article present proper design parameters adjusted to the properties sorting and warehouse management of potatoes in domestic situation by simulating and optimizing design. It offers the reference data for the design and manufacture of domestic device for sorting and conveying the potatoes. It also helps decrease the amount of labor and raise productivity in sorting and conveying potatoes.