A method and apparatus for managing SCells during a conditional PCell handover in a wireless communication system is provided. A wireless device receives, from the source PCell, a handover command including a PCell condition for a target PCell. The handover command includes at least one of Secondary Cell (SCell) conditions for target SCells. A wireless device evaluates the SCell conditions for the target SCells upon determining that the PCell condition for the target PCell is met. A wireless device transmits, to the target PCell, a handover complete message including result of the evaluation of the SCell conditions for the target SCells.