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Xyloglucan endotransglycosylase is an identified relaxation factor with functions of easing and extending of plant cell walls. Its activities are directly related to plant growth and elongation of organisms. Anthocephalus chinensis is a tall and fast growing evergreen tree species. We cloned the full cDNA sequence of AcEXT genes which is abundantly expressed in the cambium of A. chinensis. The sequence analysis of nucleotides and amino acids revealed the presence of a 1396 bp full cDNA sequence, including a 960 bp complete open reading frame (ORF) encoding a 320 amino acid protein. The deduced amino acid sequence of AcXET was homologous to the other known XET proteins and contained the conserved EIDFE catalytic site which was specific to all the XETs. Our data should serve as a foundation for further insight into AcXET gene molecular mechanisms during wood formation and cell wall engineering of woody plants.