To improve abiotic stress tolerance of Eucalyptus forestry plantation trees, the novel transgenic Eucalyptus camaldulensis harboring expression cassette of bacterial codA gene were developed. In this study, we designed two sorts of construct that were different in the transcriptional terminator, i.e. NOS terminator and HSP terminator, and conducted their comparison by the six-month semi-confined screened-house cultivation trial. The transcription levels of codA of HSP terminator lines were 4.1 to 5.4-fold higher than that of NOS terminator lines. The accumulation levels of metabolic product, glycine betaine, of HSP terminator lines were 1.7- to 2.6-fold higher than that of NOS terminator lines and were 40- to 62-fold higher than that of non-transgenic lines. The growths of the transgenic trees under moderate salinity stress condition were 2.1- to 5.0-fold higher than that of non-transgenic lines, and the growth alleviations were correlated to the glycine betaine concentrations. These results suggest that glycine betaine led to growth alleviation in salt stress condition and the additional enhancement of codA transcription level would increase further abiotic stress tolerance of Eucalyptus plantation trees.