If added 6 percent of polyethylene in domestic asphalt AH-70,the PE modified asphalt can be made; and then added 6 percent of nano calcium carbonate in PE modified asphalt,the NPCC and PE complex modified asphalt can be made.An experimental research has been conducted for regular technical properties and dynamic mechanical properties of polyethylene and NPCC and PE complex modified asphalt.The experimental result of the regular technical properties shows that after the domestic asphalt AH-70 is modified by adding polyethylene,its high-temperature stability,low temperature crack resistance and temperature sensibility have been improved,and these properties have been further improved by adding nano calcium carbonate in PE modified asphalt.The experimental result of dynamic mechanical properties also shows that it is beneficial to improve the high and low temperature properties of PE modifies asphalt by adding nano calcium carbonate.