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Recently lead-free piezoelectric material with large strain response was paid great attention due to its potential for "on-off" actuator applications.Several large-strain Bi0.5Na0.5TiO3(BNT)based systems were also proposed in our previous work with high normalized strain up to～600 pm/V under a moderate field.1-4 This value is close to that of the traditional Pb(Zr1-xTix)O3(PZT)system.Nevertheless,so far,we have only considered the maximum achievable strains in lead-free piezoelectric systems.There are several more issues needed to be considered for practical actuator application.Fatigue study on the lead-free piezoelectric systems is one significant issue which was still at an early stage with quite limited publications.5 Here the long-term stability was focused on one of the large-strain system Bi0.5Na0.5TiO3-BaTiO3-SrTiO3(BNBST).1 The bipolar fatigue results of this solid solution with different order states all exhibited quite excellent fatigue behavior up to 106 cycles.The mechanism responsible for the fatigue-resistant response was discussed.The excellent fatigue properties make the BNT-based lead-free system favorable for practical applications.