Objective To improve the success rate of unpaid blood donation recruiting,and promptly provide sufficient and safe blood products for clinical use.Methods An integral award scheme was adopted for platelets donors to stimulate their initiative of blood donation without repayment.Results From November 2011 to April 2012,platelets were collected in 3 547 person-time,those donated for more than two times were 2 145 person-time,in which,1 979 person-time were point-card holders,accounting for 92.26% of total car...