By searching the Journal Citation Reports of Social Sciences Citation Index database, this study investigates the characteristics and compares the difference on citation data for 53 journals of library and information science. The journal citation data that were explored include cited times, impact factor, immediacy index, citing half-life, cited half-life, self-citing rate (synchronous self-citation) and self cited rate (diachronous self-citation). Moreover, the relationship between each citation data and two self-citation rates, and the mean difference between two self-citation rates are examined by statistical tests.