Abstract: A light source adjustment system is disclosed. The light source adjustment system includes a signal generation module, a switch circuit, and a light emitting element. The signal generation module is used for generating a control signal. The switch circuit is electrically connected to the signal generation module for determining whether a power signal is outputted according to the control signal. The light emitting element is electrically connected to the switch circuit for emitting a light signal according to the power signal; wherein the signal generation module adjusts a generation ratio of the control signal so as to control a brightness of the light signal.