At present, part of acetylene gas with carbide slag slurry emissions into the atmosphere in PVC production process by calcium carbide method, not only polluted the environment, and caused losses to the enterprise, but also had potential safety hazards,therefore,acetylene gas recycling technology from carbide slag slurry used by Hebei Sheng hua Chemical Industry Corporation Ltd.,was introduced.Through the actual running status of the device of recovering acetylene gas, the reasons of the abnormal condition of carbide slag slurry acetylene recycling device in operation process were analyzed,some feasible measures were proposed, acetylene gas from carbide slag slurry was effectively recovered, and the production costs of PVC were reduced, enterprise efficiency were improved, multiple effects of environmental pollution were reduced. 200 kt／a PVC production facility were took as example, the economic benefits of recovering acetylene gas were about 7.19 million RMB/a .