The crystal growth and property of LGT and LGN piezoelectric crystals were presented in this paper．By using Czochralski method，80 mm×90 mm crystal boules have been succesfully grown．The relative dielectric constants and the piezoelectric strain constants have been determined by LCR electric bridge and resonantantiresonant method.The resistivity depanding on temperature has also been demonstrated. The result indicates that both of the crystal have excellent piezoelectric properties and potential use for high temperature sensing.