A tray is provided for an electronic device, and the tray includes a base and a baffle. The base has a bottom surface, a first sidewall and a second sidewall that are connected to the bottom surface. The first sidewall is connected to the second sidewall. The second sidewall has a plurality of opening portions. The baffle is rotatably connected to the first sidewall of the base. The baffle is used to rotate relative to the opening portions. Accordingly, the rotation of the baffle may adjust the flow rate and the angle of the air flowing through the opening portions. In addition, the baffle may also be accommodated in the base, and thereby electronic components may be held over the tray and the baffle.