For high power 600W and above, such as 1U servers, the space limitation makes it difficult for multiple heat pipes to achieve the heat transfer effect, so the problem of height limitation can be solved by using a high-power large-size heat spreader with a thickness of 4mm. In the 2-10W range, mobile phone heat spreaders with a thickness of 0.4mm or less is taking over from graphene and ultra-thin heat pipes.