Disclosed is a method for controlling an embedded system and a device with an embedded system, the method including: transmitting, by a scheduling process of the embedded system, a standby instruction to a master process of the embedded system; releasing, by the master process, occupied hardware resource and exiting upon reception of the standby instruction; starting, by the scheduling process, a standby process of the embedded system after the master process exits; and controlling, by the standby process, the embedded system to enter a standby state.