Abstract: A renovated structure for an adjustable desk chair comprises a base frame, a front and a rear sliding thimbles and two bolts, in which a tabletop support and a seat support are joined together on the top end of the base frame and the ends of both are separated, two grip slides are inserted in the tabletop support and the seat support, respectively, cooperating to two bolts, to fasten the front and the rear sliding thimbles on the tabletop support and the seat support respectively by passing said bolts through the through-hole on the sliding thimbles and the slotted holes on the supports to bolt in said grip slides. In practicing, loosen the bolts, the front and the rear sliding thimbles can slide up-down along the supports separately to adjust the heights of the tabletop and the seat and the space between them to suit a wide variety of builds of the users.