Abstract: A support structure for a point of sale system terminal includes a base frame having an inner back plate and two opposite inner side plates connected with two opposite sides of the inner back plate and each provided with at least one first coupling portion and at least one second coupling portion, a housing covered on the base frame and having an outer back plate and two outer side plates connected with two opposite sides of the outer base plate and each provided with at least one third coupling portion detachably coupled to the first coupling portion of the associated inner side plate of the base frame, and a shield having at least one forth coupling portion on each of two opposite sides thereof detachably coupled to the second coupling portion of one of the inner side plates of the base frame. The support structure can be assembled without tool.