目的　探讨气 -液交换术治疗玻璃体切割术后再出血的疗效。方法　将消毒空气注入眼内 ,达到一定压力 ,置换出玻璃体腔内血性液体 ,眼内压正常后 ,拔出针头。玻璃体腔内消毒空气 3～ 7天后吸收 ,最后透明的液体留存于玻璃体腔内。结果　 2 1例玻璃体切割术后再出血患者行气 -液交换术后 ,视力明显提高。经统计学处理 ,治疗前后视力提高 ,差异有显著性 (P<0 .0 1)。结论　认为气 -液交换术是一种简单易行 ,疗效肯定的治疗方法。 Objective To investigate the efficacy of gas-liquid exchange for the treatment of rebleeding after vitrectomy. Methods Sterilized air was injected into the eye to achieve a certain pressure, replacement of bloody fluid within the vitreous cavity, intraocular pressure normal, pull out the needle. Vitreous cavity disinfection of air 3 to 7 days after absorption, the last transparent liquid retained in the vitreous cavity. Results 21 cases of vitreous hemorrhage after resection of patients underwent gas-liquid exchange, visual acuity was significantly improved. After statistical analysis, visual acuity improved before and after treatment, the difference was significant (P <0.01). Conclusions that gas-liquid exchange is a simple and effective treatment of certain treatment.