A light-on aging test system electrically connected with a plurality of flat panel displays for conducting aging test to the flat panel displays, which includes at least a signal generator for generating a power signal and a first control signal, at least a signal regulating circuit electrically connected with the signal generator for regulating the first control signal into a second control signal according to an examination condition, and a voltage boosting circuit electrically connected with the signal regulating circuit for boosting the signal level and driving capability of the power signal and the second control signal. The boost power signal is outputted to drive the flat panel displays and the second control signal is inputted to the flat panel displays to perform light-on aging test to the flat panel displays.