Abstract: Abstract: The biogas-linked eco-village circulating system (BECS) plays an important role in sustainable development of eco-agriculture and new countryside construction. In this study, Beilangzhong village (Shunyi district, Beijing, China) was taken as a case study, and evaluation framework was established to analyze its input and output composition. The emergy-based indexes were listed focusing on resource utilization, environmental security and sustainability, economical benefits, as well as self-organization ability. The two indicators (renewable ratio (R%), emergy self-support ratio (ESR)) were applied to assess its resource utilization. The indicators of economical benefits involved emergy yield ratio (EYR) and emergy investment ratio (EIR). The feedback of yield emergy (FYE) was used to assess the self-organization ability of the system. While three indexes including environmental load ratio (ELR), environmental sustainability index (ESI) and the multiply of ESI and ESR (Emergy/Environment sustainable index, E/ESI) were adopted to analyze the environmental security and sustainability. Compared with the biogas-linked planting-breeding circulating agriculture system (BPCAS) and "four in one" agriculture system (FIOAS), the characteristic, advantages and future alternatives of the BECS were analyzed. The results indicated that the total input emergy was about 6.26×1019 sej/a, among which, the feedback emergy accounted for 29.16%. For the rest of input emergy, the proportion of the renewable resource could reach 86.77%, followed by non-renewable resources. On the other hand, the purchased resource was accounting for 96.70% and the rest was from free environment resources. Human labor, raw material of forage, electricity and fossil energy were the main inputs. The total output of BECS was 1.91×1020 sej/a, which was larger than the input emergy with the output/input ratio of 4.31. Breeding subsystem dominated in the BECS, followed by the planting subsystem and organic fertilizer subsystem, and the biogas system ranked the last. However, the feedback of biogas, biogas slurry and biogas residues played an important role for the BECS. The internal feedback emergy of the subsystem was about 1.83×1019 sej/a, and fertilizer ranked first accounting for about 34.06% and it was followed by forage and agricultural residues. The emergy-based indexes revealed that the BECS had its superiority with high proportion of renewable resources, low environmental loading rate, high circulation utilization rate and internal feedback, as well as good sustainability and strong stability. Compared with the BPCAS and FIOAS, firstly, the R% of the BECS was about 86.77%, higher than that of the other two systems; however, because of its comprehensiveness, product diversity and large amount of purchased input, BECS had a lowest ESR. Secondly, the EYR of the BECS was 4.46, indicating that the BECS had a good performance in economical benefits and the products had enormous competitiveness; however, the large amount of purchased input influences its EIR, increasing internal feedback and reducing purchased input can make the EIR decrease and obtain more economical benefits. Thirdly, the FYE of BECS, BPCAS and FIOAS were 0.43, 0.19 and 0.01, respectively; thus, the BECS had the largest internal feedback and self-organization ability. Finally, the ELR of the BECS was about 0.10, indicating that the system had a low environmental load. The ESI was an important indicator to assess the sustainability of the system; and the ESI of the BECS was about 43.16, which was 2.52 and 7.39 times higher than that of BPCAS and FIOAS, respectively. The high E/ESI value showed that the BECS was a sustainable circulating system with lower consumption, lower environmental pollution and higher yield. The annual economic output value of BECS was about 23.43 Chinese Yuan per unit area (m2). The recommendations were also provided for the BECS to achieve more comprehensive benefits in this study.