the harrow is mainly used to eliminate stubbles, eradicate the harden surface, return the broken straw to the fields before ploughing and to crush the earth , level the land and preserve the moisture of the soil etc. After ploughing in cultivated land, it can plough the land instead of ploughing. The disc harrow can match with the caterpillar tractor or the wheeled tractor, the work efficiency is high, the power use is reasonable, it has great ability to penetrating and shatter the soil .After harrowing , the surface is even、the soil is loose , being well suitable for heavy clay soil, wasteland and weedy land.