Colorless cubic crystal, white or off-white, granular, honeycomb block, spherical, irregular granular, powder. Slightly toxic, odorless, slightly bitter taste. It is highly hygroscopic and easily deliquescent when exposed to air. It is easily soluble in water, the solubility is 74.5 g/100g water at 20℃, and a lot of heat is released at the same time (the dissolution enthalpy of calcium chloride is -176.2cal/g), and its aqueous solution is slightly acidic.