The growth and piezoelectric property of La3Ga5.5Nb0.5O14 crystal were reported. By using Czochralski method，55 mm×150 mm crystal boule has been succesfully grown，which is transparent, inclusions free.The relative dielectric constants and the piezoelectric strain constants have been determined by an electric bridge and resonant anti resonant method.The diversity between the top and the bottom has been determined less than 3%, which shows the excellent uniformity of the crystal.