Comparing other possible actuators for compliant mechanisms, shape memory alloy has an advantage in terms of compactness and the specific actuation energy. In this work, actuation capacity of an SMA wire under different prestressed condition has been studied. To perform this study, due to the elastic nature of the compliant mechanism, the mechanism has been modeled as a spring and considered the entire system to be a spring and SMA wire assembled in series. With a suitable constitutive model for SMA, the displacement of spring has been simulated for cyclic thermal loading. This analysis has been repeated for different prestressed condition. The simulation results show the strong dependence of prestressed value with the actuator displacement.