The heating problem of network set-top box is common for us in the process of using, so good heat radiation is very important for the performance of the box. Therefore, the major set-top box manufacturers try their best to achieve it through the body opening, that is, radiation hole, but in fact, not all boxes have radiation holes, such as Mi Box, Baidu Shadow Bar, Tmall Box and so on. Perhaps the manufactures have full confidence in their products or perhaps they compromise on design, but it should be pointed out that not all box manufacturers are as rich and willful as the above big manufacturers, so risks from the heating have to be taken into consideration in the design process of the box, so that all kings of radiation holes can make us have this article today. In general, square-bar heat radiation hole is the most common design, the plastic material has more radiation holes than that of metal material, and the small size has more holes than that of big size. All heat radiation holes are near the motherboard or even CPU. Whether it conforms to aerodynamics or not is unknown. Can these heat radiation holes really play the role of timely heat radiation? We look forward to answers from consumers.