Abstract: The deformation of two contacting plates irradiated by laser can influence heat transfer by contact obviously. The effect of atmospheric pressure on heat transfer by contact are analyzed by some experiments and numerical simulations. It is shown that: the effect of pressure on heat transfer by contact is prominent, when atmospheric pressure is up to some degree, the interface of two plates always contact each other closely, and the rear temperature raise curve is protruding toward up; when atmospheric pressure is in some scope, the interface of two plates contact ever and again, and the rear temperature raise curve is analogous to linearity; when atmospheric pressure is under some degree, the rear temperature would transit up at some time. Three kinds of temperature curve would be observed