In this paper, the capacity of solidification and mechanism of ettringite to heavy metal ions (Cr, Pb, Zn, Cd,Cu) with different valence and existence form were analyzed, and the curing stability of ettringite to heavy metal under the freezing and thawing, salt chlorine erosion, carbonation and complex environmental factors were also discussed.The study has been carried out by means of X-ray diffraction analysis, scanning electron microscopy, infrared absorption spectroscopy analysis and other analysis method.