The working principle of vapor chamber is similar to that of the heat pipe, including four main steps of conduction, evaporation, convection and solidification. A vapor chamber is a two-phase fluid device consisting of pure water injected into a container filled with microstructures. Heat is transferred into the plate by heat conduction from the external high temperature area. The water around the nearby heat source will quickly absorb heat and vaporize into steam, taking away a lot of heat, then by using the latent heat of water vapor, when the steam in the plate diffuses from the high pressure zone to the low pressure zone (also known as the low temperature zone) and the steam comes into contact with the lower temperature of the wall, the water vapor will quickly condense into a liquid and give off heat energy. The condensed water flows back to the heat source by capillary action of the microstructure to complete a heat transfer cycle and form a two-phase circulation system in which water and water vapor coexist. The gasification of the water in the vapor chamber continues, and the pressure in the chamber is balanced as the temperature changes.The heat conductivity of water at low temperatures is low,however, because the viscosity of water will change with the temperature, so the soaking board can operate at 5℃ or 10℃ because the liquid backflow is by capillary force, so the soaking board is less affected by gravity, the application of the system design space can be any angle. Vapor chamber without power and without any moving components, is a passive device completely sealed. Vapor chamber container material mainly for oxygen-free copper C1020, working medium can be mainly for pure water, capillary structure can be sintered sintered copper powder, copper wire net. Vapor chamber shape can be planar, can also be for the 3D.