A sodion triethylenetetramine-bisdithiocarbamate(DTC-TETA) and its complexes with heavy metal ions were investigated by FTIR,UV,FAAS and elemental analysis,respectively.The FTIR spectrum of DTC-TETA showed strong absorption peaks at 1 461-1 388 cm^-1 and 1 174-996 cm-1 which were attributed to partly double bonds of C and C,respectively.The UV spectrum of DTC-TETA had two absorption peaks at 265 and 290 nm,assigned to π—π* transition of N…C…S radical and nonbonding electron n—π* transition of S…C…S radical to conjugated system,respectively.The elemental analysis results demonstrated that the mol ratio of C,H,N and S in DTC-TETA was about 2:4:1:1.As for UV spectrum of its complexes with Cu(Ⅱ),Cd(Ⅱ),Zn(Ⅱ) and Ni(Ⅱ), there were four new absorption peaks at 321,310,311 and 325 nm,respectively.Coupled to flow-injection,FAAS determination showed that the complexation performance of Cu2+,Cd²⁺,Ni2+ and Zn2+ complexes of DTC-TETA was better than that of sodium diethyldithiocarbamate (DDTC).