The variation of the amount of hybrid sweet sorghum with harvest by stages,multiple crapping of wheat stubble,and usual planting with different kinds of fertilization was studied.Results showed that for hybrid sorghum,for the more favorable combinations,the yield of correlative land was more than 59.6 t/hm².Under the same condition,the harvest by stages,which provided higher yield and more fresh and tern der plant,showed the more favorable effect than usual one-step-harvest,and one of the stage harvest combnation provided the highest yield among the ten combinations of different kinds of fertilization and different plant populations.It is operable to plant sequential cropping hybrid sweet sorghum in wheat stubble in the chilly Heilongjiang Province.The best combination of fertilizer and plant population,of which yield coukl reach 31.3 t/ hm²,provided 9.3% and 8.3% daily yield incxease of fresh grass more than usual planting and harvest by stages,respectively.Considering that the cultivated area of wheat in Heilongjiang Province was almost 200000 hectares,multiple crapping of wheat stubble would produce 6000000 ton fine quality fresh forage,which can not only take advantage of the limited resources of light and temperature and reduce soil and water loss,but also promote the development of animal husbandry.