Abstract: The influence of wastewater composition on the cyanide removal efficiency by a promising treatment method called gas filled membrane absorption (GFMA) was investigated in this study using real acrylonitrile wastewater, which was produced from Jilin Petrochemical Industry Company. The results showed that the cyanide in the acrylonitrile wastewater mainly existed as free cyanide. The volatile acrylonitrile coexisting in the effluent had little effect on the cyanide removal by GFMA. However, high concentrations of acetone cyanhydrin had great influence on the cyanide removal efficiency. If GFMA were applied to acrylonitrile wastewater treatment successively in the sequence of ammonia and cyanide removal, the cyanide removal efficiency could increase from 40%-70% to 82%-90% due to the heating and alkali aqueous solutions, which benefit acetone cyanhydrin decomposition to volatile HCN. In the meantime, the ammonia removal rate could reach as high as 93.3% in the same process. In conclusion, GFMA can remove and recover the ammonia and cyanide from acrylonitrile wastewater effectively, which benefits the subsequent treatments and makes biological treatment possible.