A depth generation system with adjustable light intensity includes at least one light source, at least one image capturer, a depth map generator, and a controller. Each light source of the at least one light source is used for generating emitted light. Each image capturer of the at least one image capturer is used for capturing an image including at least one reflected light generated by at least one object reflecting the emitted light. The depth map generator is coupled to the each image capturer for generating a corresponding depth map according to the image or the at least one reflected light. The controller is coupled to the depth map generator for determining whether to adjust intensity of the emitted light according to information of the corresponding depth map or intensity of the at least one reflected light.