The dielectric, piezoelectric and some elastic constants of the Ca3NbGa3Si2O14 crystal had been determined by using Ycut and (yxl)30°cut crystal samples.The calculated piezoelectric constants as functions of cut a ngle of (yxl)θ cut were also given. The Ca3NbGa3Si2O14 crystal showed superior piezoelectric properties with relatively large piezoelectric constants (d11=7.93×10-12C/N，d14=-5.88×10-12 C/N) compared with La3Ga5SiO14 crystal.

The dielectric，elastic and piezoelectric properties of the La3Ga5SiO14 crystal have been investigated. Its elastic and piezoelectric constants were measured by the resonant method through high-frequency vibration mode.

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