In this thesis, the study on analytical functions of organic reagents was summarized. The up-to-date category,synthesis,the relationship between chemical construction and performance and application of triazene group chromogenic were summed up. Triazene group chromogenic becomes hotspot-researching direction because of high sensitivity,larger contrast,good stability of complex and high selectivity in determining some heavy metal ions. Recently there many new triazene group chromogenics were synthesiz...