Abstract: The TCP genes of tea plant（CsTCPs）were identified from the‘Shuchazao’（Camellia sinensis L.）genomic database based on the TCP protein sequences of Arabidopsis thaliana and the conserved domain sequence of TCP proteins（Pfam：03634）. In total，37 CsTCP members were identified in the tea plant genome，with the amino acid size，molecular weight，isoelectric point，and the gene intron numbers varying from 150–607 aa，16.8–67.6 kD，5.10–10.52，and 0–5，respectively. Subcellular-location analysis showed that 35 CsTCP members were localized in cell nucleus，1 CsTCP member was localized in chloroplast，and 1 CsTCP member was localized in both cell nucleus and chloroplast. There are 21 PCF，11 CIN and 5 CYC/TB1 clusters in tea plant genome according to the phylogenetic analysis，suggesting that functional differentiation occurred among the CsTCP members. Conserved motifs analysis showed that there were at least 20 motifs in CsTCP members，and similar conserved motifs were identified in CsTCP members with a closer phylogenetic relationship. Subcellular location assay demonstrated that CsTCP32 localized in nucleus，but CsTCP24 had both nuclear and cytoplasmic locations. The result suggested that the identified CsTCPs were transcription factors with nuclear localization. Drought stress，salt stress，cold stress and pathogen infection related cis elements were abundant in the promoter region of the CsTCP genes. Based on the transcriptomic data，semi-qPCR and qPCR analysis，CsTCP gene members displayed differential expression patterns in different organs of tea plants and under various stresses treatment. Thereinto CsTCP14 was mainly expressed in stems and florets，CsTCP32 was mainly expressed in buds and leaves of tea plants，CsTCP19，CsTCP20，CsTCP12 and CsTCP32 was respectively up-regulated after salt，cold and MeJA treatment，CsTCP18 and CsTCP30 was respectively down-regulated after cold and MeJA treatment.

Key words: Camellia sinensis, TCP gene, gene family, expression analysis