Objective To understand and to grasp the basic situation on blood donors who were ineligible by ALT dry chemistry testing before blood donation.Methods The ALT rejection ratios used in initial screening and not used in two blood collection point were compared at the same time.The relativity between the dry chemistry testing and rate method were compared.An association was explored in various influencing factors on the activity of ALT.Results The use of ALT initial screening in blood donation had a significantly lower unqualified rate than not using it in early screening (P＜0.05).Dry chemical,biological method and the results had good correlation rates (r=0.993,P＜0.05).The B MI,drinking,sleeping,sports,diabetes,liver disease were independent factors affecting ALT activity (P＜0.05).Conclusion ALT initial screening can significantly reduce the unqualified rates and disposal of blood.