PURPOSE: To manufacture a high function sheet of superior uniformity and smoothness by extrusion molding a high function resin of the like prepared by mixing resins having the molecular weights being different by two digits or more.

CONSTITUTION: High function resin prepared by mixing resins having the molecular weight being different by two digits or more, high function resin prepared by mixing at least either of crystalline resin or elastomer with resin and high function resin prepared by mixing resins of totally different chemical composition are extrusion molded respectively to manufacture a sheet. The sheet thus prepared is provided with lubricity, resistance to heat, chemicals and the like according to its composition, and the sheet is uniform and smooth.