The subjects of this research were 776 pupils from grade three to grade six in Shandong Province, China. This study examined the influence of teacher support on students' reading engagement, and the mediating variables between those two factors, as measured by the perception of teachers' support scale, reading engagement scale, reading interest scale and Chinese academic self-concept scale. Results showed that the reading engagement of primary school students who lived in urban areas was significantly greater than that of students in rural areas. Moreover, teacher support positively influenced primary school students' reading engagement, and reading interest had a mediating effect on teacher support and reading engagement, whereas the Chinese academic self-concept did not mediate such relations. However, Chinese academic self-concept completely mediated the relationship between teacher support and reading interest, such that there was a specific sequential effect between teacher support and reading engagement that formed an intermediating chain.