Relaxor ferroelectric single crystal Pb(In1/2Nb1/2)O3-PbTiO3 (PIN-PT) has a higher Curie temperature than Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT), which has a prospect in the application of sensors and transducers requiring high stability and high performance. In this work, the full matrix mechanical and electrical properties of ［001］-poled 0.66PIN-0.34PT ferroelectric single crystal were studied by resonance method. The rhombohedral-tetragonal transformation temperature (TRT) and Curie temperature (TC) of 0.66PIN-0.34PT single crystal are 160 ℃ and 260 ℃, respectively. The room temperature piezoelectric coefficients d33, d31 and d15 of 0.66PIN-0.34PT ferroelectric single crystal are 1 340 pC/N, -780 pC/N and 321 pC/N, respectively. The dielectric constants εT33, εS33, εT11, εS11 are 2 700, 905, 2 210, 1 927, respectively. The electromechanical coupling coefficients k33, k31, k15, kt are 87%, 58%, 38%, 61%, respectively. The value of piezoelectric constant (d33) and electromechanical coupling coefficient (k33) of 0.66PIN-0.34PT single crystal are smaller than those of PMN-PT single crystal, but the transverse piezoelectric properties (d31) and shear piezoelectric properties (d15) are slightly higher than those of PMN-PT single crystal. In addition, the trend of variation in electromechanical coupling performance was studied, and it is found that 0.66PIN-0.34PT single crystal has good temperature stability below 150 ℃.