Global warming arising from the influx of excessive greenhouse gases, has highlighted the importance of reducing them from the atmosphere. Intensive efforts were made to uncover biomass-based materials that can catalyze the synthesis of cyclic carbonate from CO2 and epoxides. In this work, a biomass based catalyst system consisting of 1, 8-Diazabicyclo (5.4.0) undec-7-ene (DBU) and xylan was developed for efficient fixation of CO2 with epoxides to synthesize cyclic carbonates. The results showed that the catalyst composition, reaction time, temperature and pressure had remarkable influences on the catalytic activity of DBU/xylan. A high yield of 85% propylene carbonate (PC) was achieved under the optimal reaction conditions (DBU: xylan = 5:1, 3.0 MPa, 4 h, and 120 degrees C). In addition, the catalytic system could be suitable for the cycloaddition between CO2 and other epoxides or aziridines. Compared with other biomass-based catalysis system, the DBU/xylan exhibited a better catalytic activity, owing to the exceptional synergistic effect between DBU and xylan.