NOVELTY - A carbon paste is prepared by mixing Butyl Carbitol (RTM: acetate solvent) and unsaturated polyester resin, heating the mixture, adding dibutyl phthalate and ground carbon black, mixing, adding black lead and fumed silica, stirring, adding defoaming agent and flattening agent, mixing, adding butyl cellosolve and isothiocyanate, and stirring.    USE - A carbon paste for a geothermy film (claimed).    ADVANTAGE - The carbon paste has positive temperature coefficient characteristics, promotes normal metabolism and blood circulation, activates cells and enhances human body immunity.    DETAILED DESCRIPTION - A carbon paste is prepared by mixing Butyl Carbitol (RTM: acetate solvent) and unsaturated polyester resin having a molecular weight of 20000 at weight ratio of 2-3:1, heating the mixture at 100-140 degrees C to obtain polyester adhesive, adding (wt.%) dibutyl phthalate (68-70) and ground carbon black (7-8) having absorption valve of 100 ml/100 g, mixing, adding (wt.%) black lead (2.5-3) and fumed silica (2.2-2.8), stirring, adding (wt.%) defoaming agent (0.5-1) and flattening agent (1-1.5), mixing, adding butyl cellosolve (11-12) and isothiocyanate (4-4.5) having cyanate content of 24%, and stirring. INDEPENDENT CLAIMS are included for:    (1) a geothermy film comprising resin-aluminum foil composite film coated with the carbon paste and equipped with electric conduction metal strap;    (2) a method of preparing the geothermy film comprising utilizing resin-aluminum foil composite film having a surface having a hollow cavity, removing aluminum foil via etching processing, dividing aluminum foil into two disconnected area with hollow cavity, shelling the etched resin-aluminum foil with carbon paste, connecting with electric conduction metal strap, and compositing lamination film; and    (3) a method of installing the geothermy film comprising placing insulation extruded plate on the ground, placing geothermy film on the insulation extruded plate, placing protective layer comprising non-woven fabrics or glass fiber mesh cloth on top of the geothermy film, and placing floor board on the protective layer.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic view of an aluminum foil composite film etching.    S-shape bent (10)    Divided areas of aluminum foil (11-12)