Cataract is the major cause of blindness in China, cataract extraction and intraocular lens implantation in cataract surgery is a main effective means for the cataract patients to restore vision, bacterial endophthalmitis is the most serious complication. Currently the prevention of endophthalmitis depends on the use of antibiotics, and conjunctival sac of the preoperative patients has also been paid more and more attention to. In this paper, status of the conjunctival sac preparation before cataract surgery are analyzed, mainly are the following two points: (1) application of preoperative antibiotic eye drops to conjunctival sac; (2) disinfection and flushing of preoperative conjunctival sac. Here，the use of warm saline in conjunctival sac flushing liquor is proposed. Moreover， the other surgeon have raised that preoperative treatment of meibomian gland is necessary.