A touch display apparatus is disclosed, which includes a touch display panel with an active area and a peripheral area. The touch display panel includes a substrate, touch electrodes, touch sensing lines, dummy touch sensing lines and transistors. The touch electrodes are disposed on the substrate and in the active area. Each touch sensing line is electrically connected to one of the touch electrodes. The touch sensing lines and the dummy touch sensing lines are in parallel with each other in the active area. The dummy touch sensing lines are electrically connected with each other. Each transistor has a first terminal, a second terminal and a control terminal. The first terminals of the transistors are electrically connected with each other, the second terminal of each transistor is electrically connected to one of the touch sensing lines, and the control terminals of the transistors are electrically connected with each other.