Abstract: The article puts forward a processing method of polarisation treatment and resolves the problem of less bondness between polyethylene pipe and polyarethane foam in polyethylene foam jacket pipe. Meanwhile, it sets forth its position on some questions in the mechanism research of polarisation treatment in detail. It points out tnat it is fundemental to increase the compound character of polyethylene surface roughness, surface tensile stress and attraction among elements, etc, and that the way of increasing attraction among elements is putting polar group into the elementary structure of polyethylene surface.