Objective To evaluate whether the stimulation on eyes of bendazac lysine eyedrops could be reduced by cold storage.Methods Mate design scheme and double-blind clinical trial were performed. 160 healthy eyes was divided into two groups: the test group was given bendazac lysine eyedrops which was stored in refrigerator at 4℃ over night, and the control group was given it which was stored at room temperature.Results ln the control group and the test group, the occuring rate of stimulation was 19.30% and 6.25%. The cases of B、C stimulation degrees were 31 and 10; the average stimulation degrees of each group were 1.21 and 1.07, the scoring change for eye stimulation were 1.57±1.50,0.79±1.40,all respectively. The statistical difference was significant (P<0.05 or P<0.01).Conclusion The eye stimulation of bendazac lysine eyedrops can be reduced by cold storage.