Abstract: In order to enrich environmental xenon, hollow fiber membranes were used for gas sample pretreatment to remove the great deal of impurities such as nitrogen, oxygen, carbon dioxide and vapor, and enrich the xenon. An experimental apparatus was developed for researching the performance of impurities removal and xenon enrichment. The effect of temperature, flow rate, stage cut, membranes amount, connective form and gas origin was studied respectively. The results show that the gas flow rate and environmental temperature hardly influence the performance of membranes. The xenon loss rate is lesser when three or four membranes are connected in series. When the stage cut is 2/3, the xenon loss rate is no more than 10%, and the removal rates of CO₂, H₂O and O₂ are no less than 99%, 90% and 90%, respectively. The xenon loss rate of the samples from surface air is slightly higher than that from subsurface.