Abstract: This study aims to conduct an emergy analysis of different biogas manure use patterns of straw biogas project for central gas supply, and evaluate ecoeconomic benefit and sustainability. Taking the biogas project in Gengguantun, Qingxian County, Hebei Province as an example, a comparative analysis of emergy input, output and emergy evaluation indices of this straw biogas project was made under 3 scenarios, normal scenario (Scenario 1), real scenario (Scenario 2) and hypothetical scenario (Scenario 3), which were designed on the basis of different biogas manure use patterns. The results showed that the emergy yield ratios of Scenario 1, Scenario 2 and Scenario 3 were 1.0023, 1.0020 and 1.0029, the emergy investment ratios were 441.45, 497.93 and 341.61, and the emergy sustainability indices were 1.08, 0.80 and 0.61, respectively. The straw biogas project has both ecological and economic benefits of energy production and crop straw dealing. With the increase of biogas residue and slurry use, the straw biogas project is more dependent on purchased emergy resource input, and the sustainability decreases. The economic reproduction characteristics of this project system are continuously strengthened, and the overall development direction is “high inputhigh output”.