One novel binuclear copper(Ⅱ) complex [Cu2(Hpt)2(CO3)2(H2O)2]·H2O with copper carbonate and 3-(pyddin-2-yl)-1,2,4-triazole (Hpt) was hydrothermally synthesized and characterized by IR and X-ray diffraction analysis. The complex crystallizes in triclinic,space group P21/n with a = 0.6862(1),b = 0.7805(1),c = 1.1983(2) nm,α = 72.03(2),β = 107.72(3),γ=75.28(2)°,V= 0.5884 nm3,Dc = 2.105 g/cm3,Z = 1,F(000) = 357,GOOF = 1.041,the final R=0.01859 and wR = 0.04348. The whole molecule is composed of two cooper ions,two Hpt molecules,two carbonate and three water molecules,forming a binuclear structure. The crystal structure shows that the cooper ion is coordinated with three nitrogen atoms from two Hpt molecules,two oxygen atoms from one carbonic acid and one water molecule,forming a distorted square pyramidal geometry. The TG analysis result shows that the title complex is stable under 131.0 ℃.