Abstract: Abstract: In China, vegetable growing area and production have increased rapidly in order to satisfy the increasing demand for vegetable and benefit, which must be accompanied by more vegetable wastes and are hard to be treated nowadays, for shortage of technologies of circular utilization without hazardous risk. The vegetable wastes without treatment must result in environmental pollution and safety risk, especially for cucumber, one of the major vegetables in China. The study was undertaken to investigate the effects of easily-degraded organic matter content (27% (T1), 36% (T2), 45% (T3), 51% (T4)) on maturity process and nitrogen loss during composting of cucumber vine in lab-scale airtight composting system, with the same mixed material weight, C/N ratio of 25, material moisture content of 60%, using the carbon additive corn stover and corn starch, and the nitrogen additive urea, and analyzed temperature, matter loss, organic matter, CO2 emission, pH value, EC (electrical conductivity), GI (germination index), NH3 emission rate and accumulation, nitrogen loss rate during the maturity process. Results indicated that along with the increase of easily-degraded organic matter content in raw material, the highest temperature in different treatments showed firstly increased and then decreased, while higher pH value, EC, and lower GI were shown together with the easily-degraded organic matter content increasing, which meant the easily-degraded organic matter content should not be too high and no more than 45% was better for higher temperature and maturity. The highest temperature (71.4 ℃) was shown in treatment T3, with more CO2 accumulation, which meant this condition was better for reducing the heating time and making no-hazardous product. However, the increase of easily-degraded organic matter content resulted in more nitrogen loss, especially more ammonia emission. The most ammonia emission was shown in T3 (380.29 mg), and the most nitrogen loss rate in T4 (36.01%), suggesting that the lignocellulose would help to reduce the ammonia emission and nitrogen loss. In summary, the ratio of 45% in mixed material for easily-degraded organic matter content is a better condition for higher composting temperature to make no-hazardous product and no influence on maturity of the product, but accompanied by higher ammonia emission and nitrogen loss rate. So with the aim to reach high temperature and low nitrogen loss during composting, additional lignocellulose input together with the 45% easily-degraded organic matter content in the material could effectively improve the composting technology, but it needs to be certified by experiment in the future.