AIM:To evaluate the feasibility of using anterior chamber maintainer in operation on vitreous. METHODS:Experimental group:20 eyeballs that had the penetrating injury,like traumatic cataract that combined with the eye-posterior trauma taken the cataract extraction associated the operation on vitreous. In this surgery the anterior chamber maintainer was used to infuse B.S.S; control group:there were 20 eyeballs that taken the the par plana vitrectomy. In this surgery the infusing ductus fixed in the incision of the sclera was used to infuse B.S.S.,and the cutter rate was setted to 540 times per min and the aspiration’s suction was setted to 150mmHg in vitreous cutter of every operation on vitreous. When the bottle height was 65cm and 70cm,the infusing rate under the state of aspiration or under the state of aspiration and excision of each eye were measured. The vitrectomy head and optical fiber were pulled out,closing the temples side with sclera nails,performing scleral incision above nose,measuring intraocular pressure in each eye when the infusion bottle height was 65cm or 70cm.RESULTS:When the infusion bottle height was 65cm,infusion rate was compared under the state of aspiration (P=0.36),and under the state of aspiration and excision(P= 0.31); when the infusion bottle height was 70cm,infusion rate was compared under the state of aspiration (P=0.13),and under the state of aspiration and excision(P=0.18);intraocular pressures between the two groups were compared when the infusion bottle height was 65cm(P=0.56),and when the infusion bottle height was 70cm(P=0.45).CONCLUSION:The use of the anterior chamber maintainer for infusing B.S.S in operation on vitreous is feasible. 