According to the weight and connect method, it can be divided into suspended light duty disc harrow and traction heavy duty disc harrow. The light duty disc haaow is mainly suitable for crushing soil after plowing, preparing soil before sowing, loosening soil, mixing soil and fertilizer and stubble removal. Heavy duty disc harrow have strong farming capabilities for heavy clay soil, wasteland and plots with lots of weeds. They are mainly suitable for clearing stubble before farming, breaking surface hardening, cutting straw and returning it to the field, breaking soil after tilling, and leveling to preserve moisture.