Objective To study the expression changes and patterns of nucleic acid and their derivative metabolism, processing and transport-related genes in rat liver regeneration (LR) at transcriptional level. Methods The related genes were obtained by online data collection and literature review, and gene expression patterns in rat regenerated liver were checked by Rat Genome 230 2.0 array. LR-related genes were identified through the comparison of discrepancles in gene expression between partial hepatectomy (PH) and sham operation (SO) groups. Results 240 genes were determined to be related with liver regeneration. The number of initially expressive genes in the forepart of liver regeneration (0.5-4 hours after PH), prophase (6-12 hours after PH), metaphase (16-66 hours after PH), anaphase (72168 hours after PH) were 65, 14, 150, 11 respectively and the total expression numbers were 133, 87, 627, 169 respeitirely. There were 6, 5, 22 and 9 expression patterns. Frequencies of upregulation and downregulation were 768 and 248. mRNA catabolism in prophase and metaphase, DNA recombination， modification and transcript, mRNA processing and transport in prophase, metaphase and anaphase, and nucleotides and their derivatives metabolism, as well as DNA replication, packaging and catabolism during the whole LR, were enhanced.Conclusion LR-related genes were mainly triggered in the forepart of liver regeneration, and fu