A communication device for handling a measurement comprises at least one storage device; and at least one processing circuit coupled to the at least one storage device. The at least one storage device stores, and the at least one processing circuit is configured to execute instructions of: receiving information of a measurement set for at least one slot from a base station (BS), wherein the information comprises at least one of a measurement timing configuration of the measurement set and a measurement resource of the measurement set; and performing the measurement in the at least one slot according to the measurement set, to obtain a measurement result.