Y-orientated langatate piezoelectric crystal with size of 80 mm×100 mm was successfully grown by Czochralski method, which is transparent, inclusions-free．The relative dielectric constants and the piezoelectric strain constants were determined by an electric bridge and resonant-anti-resonant method. The performance difference between head and tail was studied. The uniformity of frequency constant has been determined to be 99.95%, which shows the excellent uniformity of the crystal. In addition, the swing curve and the temperature coefficient of frequency(TCF) were tested on (010) crystal facet. The FHMW and TCF values were 38.5″ and 1.23ppm/K, respectively.