A receiver circuit with low power consumption and a method for reducing power consumption of a receiver system are provided. The method for reducing power consumption of the receiver system comprises steps of: providing a signal receiver module; intermittently enabling/disabling the signal receiver module when a microprocessor is in a sleep mode; detecting whether the signal receiver module receives a signal when the signal receiver module is enabled; and waking the microprocessor up to decode the received signal if the signal receiver module receives the signal.