Embodiments of the present invention disclose a method and apparatus for reducing power consumption, and a mobile terminal, which are used to reduce power consumption of the mobile terminal, and improve user experience. The method in the embodiments of the present invention includes: when a system enters a preset working mode, detecting a first-type application and a second-type application that are installed in the system; changing a type of an alarm of the first-type application, and suspending an alarm of the second-type application, so that the alarm of the first-type application cannot wake up the system in the preset working mode, and that the alarm of the second-type application cannot wake up the system in the preset working mode and/or is not woken up by the system when the system is in an awake state.