From July 1, 2014 to June 30, 2015, a total of 558,089 blood donations were collected at six blood centers located in different areas of China (see Figure 1). The demographic characteristics of all of the donors at the six blood center were collected, and the distributions of all demographic characteristics were examined (see Table 3). Among the Anhui, Dalian and Fujian Blood Centers, almost 60% of all donations came from donors aged between 18 and 35 years old, while almost 40% at Changzhi, Kaifeng and Mianyang blood centers were of this age group. Across all of the blood centers, the proportions of male and female donors were 63% and 37%, respectively. Donors with a high school education or less contributed to 70% of all donations. Overall, more than half of the donors were employees and students. There were significant differences in the constitutions of donors in terms of their demographic characteristics across the six blood centers in this study.