Abstract: In order to objectively evaluate the production potential of biomass energy in Ningxia Region,sweet sorghum,Jerusalem artichoke,and switchgrass were selected as energy crops suitable for planting on the marginal land with limited water and soil resources.Considering the precipitation condition,the water demand characteristics of energy crops and the theoretical minimum water demand for energy production,an energy crop combination plan is determined to improve the local biomass energy production potential,and the maximum biomass energy yield potential of Ningxia is quantitatively calculated.The results show that:1)the total area of marginal land in Ningxia is 31305.49 km~2,accounting for 62.13% of the whole region,mostly in the middle and southwest,and 25053.82 km~2,21287.12 km~2 and 3900.54 km~2 of which are suitable for planting sweet sorghum,Jerusalem artichoke and switchgrass,respectively;2) the combination plan of sweet sorghum and Jerusalem artichoke can effectively improve the biomass energy production potential in Ningxia.Without artificial irrigation,the maximum production potential of biomass energy in Ningxia could reach 10.93×10~7 GJ per year.