Abstract: A height adjustable structure of a desk combination includes a drawer cabinet having two sides each provided with a fixed plate, a gear and a pivot arm pivotally mounted on the fixed plate, a torsion spring mounted on the pivot arm so that a mediate portion of the pivot arm is deflected leftward or rightward by the torsion spring, a protective board mounted in an opening defined in the upper portion of the fixed plate, a movable plate slidably mounted on the protective board and having a lower portion defining an elongated successive multiple stepwise locking slot, a rack mounted on one side of the movable plate and meshing with the gear, a support frame secured on a top of the movable plate and engaged with a table face. In such a manner, when the height of the table face is adjusted, the rack of the movable plate is slidable on the gear of the fixed plate.