The calcium aluminate silicate (Ca2Al2SiO7, CAS) piezoelectric crystal was grown by the upweighing Czochralski (CZ) method with the radio frequency heating. The growth habit of CAS crystals at different rotation rate and growth direction was studied. The effects of the rotation and growth direction on the morphology of CAS crystals were analyzed theoretically. It can be found that the morphology of CAS crystal was changed from round column to square and rectangular solid with the rotation rate increasing. The crystal presented polycrystalline morphology when the rotation rate reaches threshold limit value. The CAS crystal has different manifest facet with different growth direction, and had very strong manifest facet (001) during the growth process. The different manifest facets were characterized by Xray diffraction spectroscopy analysis, and rocking test for (001) facet was carried out. The results indicated that the asgrown crystal structure was complete and the crystalline property was good.