Process conditions and properties of crosslinking polyethylene were studied by peroxide crosslinking method. Effect of the crosslinking reaction on mechanical properties and crosslinking degree of the crosslinking polyethylene was discussed. Melting behavior of the crosslinking polyethylene was characterized by DSC. The result showed that when crosslinking agent double 2,5 is 1.5%, reaction temperature is 180 ℃, reaction time is 5 minutes, the crosslinking degree of the crosslinking polyethylene reaches 74.2%; the tensile strength is 29.0 MPa and elongation at break is 480％; its melting temperature is 108.69 ℃.