A thermal insulation (heating) coaster design for desktop. Many people do not like to use the cup lid when using the cup to drink water. Although it is only a simple opening and closing action, the "workload" caused by the "workload" is indeed doubled-from one-handed operation to two-handed operation. But the disadvantage of not using the cup lid is also obvious, and it is easy to fall ashes. This is the starting point for the design, with temperature control and timing functions at the same time, in order to provide users with "a cup of hot water that can be prepared in advance for themselves in line with their habitual temperature.