With the decreasing in size of miniature actuators, a photostrictive actuator becomes more significant and promising for future micro-devices. In this study, the optimization of photostrictive PLZT 3/52/48, 4/48/52 and 5/54/46 ceramics through doping with Nb2O5 and Gd2O3 was investigated. Undoped PLZT (4/48/52) ceramic provided the maximum photocurrent and was fabricated into a power supply device using a parallel circuit to increase the generated current. PLZT (5/54/46) doped with 0.5 at% Nb2O5 displayed the highest values of dielectric constant, piezoelectric constant, photovoltage and photo-induced strain. It was fabricated into a micro-walker using a series circuit of which the generated photovoltage in each PLZT sample was combined and displayed the total value.