A method, device and system for resource allocation, and a computer-readable storage medium are provided. The method comprises: receiving downlink control information (DCI) sent by a base station, the DCI being used for identifying an uplink grant resource allocated to a user equipment (UE) by the base station; and when the uplink grant resource is a target resource, transmitting data of a target logical channel in a first logical channel by first using the uplink grant resource, wherein the target logical channel is a logical channel that is configured with only one transmission characteristic, and the target resource is an uplink grant resource of which the corresponding transmission characteristic is the same as the transmission characteristic configured for the target logical channel.