A novel dual-composite right/left-handed transmission line is proposed in this paper based on the reference ［8~9］, and its electromagnetic characteristics are investigated. The dispersion curve of the proposed structure has been derived by using Bloch-Floquet theory and simulator, and the D-CRLH is proved. The equivalent circuit model is given, and the extractive parameters of the model are extracted. The influences of the change of the structure parameters on its electromagnetic characteristics are analyzed by Ansoft HFSS10. Compared with the structure in reference ［8~9］, the proposed structure is simpler,and is easy to adjust in its parameters. What is more, the proposed structure is of symmetrization, and can be used in the design of microstrip antenna.