The layered taggered covering furrowing device was designed to solve the difficulty in furrowing for grassland where the soil firmness is very high and the amount of the stubble and root are too great,and to realize fertilization and reseeding based on root cutting.The device included the process of stubble cutting with cutting blade,forming seed bed and covering it with seeding double disc furrow opener,forming fertilizer bed and covering it with fertilization double disc furrow opener pressing down the soil to the specify depth in the root cutting opening and pushing the soil to cover the seed.Results of comparison experiment showed that the relationship between the soil firmness and the distance between the seed bed and the rootcutting opening could be used to determine the arrangement of the two double disc furrow openers.It was confirmed that compared with the control group the average firmness of the soil decreased 62% when the above distance was 20 mm.The function that the parameters of the two furrow openers should be satisfied through theoretical deduction was established.The furrowing device was used on the 9QFB2.4 root cutter with fertilization and reseeding compound machine in the field experiment.The result showed that the device can furrow stably and form suitable fertilizer bed and seed bed.The depth and width of the fertilizer bed was 47.3 mm and 29.1 mm.The depth and width of the seed bed was 44.7 mm and 19.5 mm.The stability of fertilizing and seeding depth could achieve 83% and 80%,respectively.While the soil broken rate was just 14%,which benefits for the protection of the grassland vegetation.