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The fatigue resistance of pseudo-ternary single crystal 0.22Pb(In 1/2 Nb 1/2)O 3 -0.53Pb(Mg 1/3 Nb 2/3)O 3 -0.25PbTiO 3 (PIMNT) is tested by a "two-step poling process" – alternate current poling (ACP) with different cycles followed by direct current poling (DCP). The remnant polarization of the hysteresis loop decreases significantly and then does not change, and the coercive field raises with increasing polarization cycles. However, the two-step poling process contributes to the optimization and stability of fatigue resistance. Before 700 cycles, the piezoelectric constant d 33 of the crystal is obviously promoted compared with the conventional DCP sample of d 33 = 2200 pC/N, which increases by 40.9%–3100 pC/N, while the average thickness mode electromechanical coupling coefficient K t remains at 0.518. With the increase in number of polarization cycles, the d 33 and K t are larger and more stable than for the ACP only sample. This improvement is due to nanoscale denser and smaller domains induced by the two-step poling process. • Two-step poling process gives single-crystal PIMNT good performance, stability and fatigue resistance. • Before 700 cycles, the process increases d 33 from 2200 to 3100 pC/N and average K t remains at 0.518 • The d 33 and K t of PIMNT after this process are larger and more stable than single AC aging. • The process reduces domain size to nanoscale and domains become denser and smaller. [ABSTRACT FROM AUTHOR]