Abstract: The influence of temperature,holding time,nickelcontent,boron content,surfacing technology,and regularity of outside contingent condition ete on infiltrated crack is deeply discussed.By means of metallographic analysis and electronic microscope analysis,in-filtrated crack mechanism is studied.A regression equation on conditionof no-stress about infiltrated depth,temperature,holding time,nickelcontent and boron content is set up by means of perpendicular test method and liner regression analysis.Surfacing technology and influence regularity of strain on depth of infiltrated cracks are studied with a method of heating changeable restrain in points.It is found that the fast diffusion of copper alloy in grain boundary of base metal and the tensile stress are the main reasons of formation and development of infiltrated cracks.