Abstract: An expandable pull rod of luggage includes a top tube, a bottom tube, and a plurality of intermediate tubes which are arranged telescopically between the top tube and the bottom tube in conjunction with a plurality of control devices. Each device has a base, a locating member, and an actuating body. The locating member is formed of a first spring, a first locating block, a second spring, and a second locating block. The first spring and the first locating block are at work such that the first locating block is located in a first locating hole of the intermediate tube at the time when the pull rod is expanded. When the pull rod is contracted, the second spring and the second locating block are at work such that the second locating block is located in a second locating hole of the intermediate tube.