Abstract: A power-saving infrared-detecting receiving system composed of a micro-controller serving as a main control unit of the receiving system, an infrared module powered through the micro-controller for receiving a modulated infrared signal emitted by a remote controller used together with the receiving system, and an ultra-low power-consuming and independently powered predetector For detecting a low-frequency infrared front guide signal emitted by the remote controller. The receiving system is normally in a standby state in which only a very low power is consumed by the predetector to detect the infrared front guide signal emitted by the remote control for triggering the micro-controller. When the micro-controller is triggered, the receiving system enters into an operational state and sufficient current is supplied to the infrared module for it to receive a complete modulated infrared signal emitted by the remote controller.