The grown condition in aqueous solutipn,morphology and polarity of 2KIO3·HC1 single crystal were studied. The transmissivity, the position of optical indicatrix in the crystal and the indices of refraction were determined and discussed. The phonomenon of phase match SHG of 1.06μm from YAG laser was observed. Its pyro- and. piezoelectric, dielectric characteristics and conductivity were determined. The anisotropy of the single crystal is interest.