Embodiments of the present invention provide a method for granting time for a terminal, and related devices. At a mobile switching center (MSC) device side, the MSC device receives an instruction of disabling a time granting function, wherein the instruction of disabling the time granting function is used for disabling a function that the MSC device delivers time information from a packet switch (PS) domain; and according to the instruction of disabling the time granting function, the time information is delivered from a circuit switched (CS) domain, and the time information is stopped delivering from the PS domain. At a mobility management entity (MME) device side, the MME device receives the time information that is delivered by the MSC device from the PS domain, the time information is discarded, and the time information delivered by the MSC device and time information constructed by the MME device according to a local time source are not delivered to a terminal. Redundant delivered time information is reduced, network load is lowered, and the system resources are saved. The present invention relates to the field of mobile communications.