PURPOSE: To enable uniform dispersion, and to obtain a molding material having improved heat resistance, wear resistance and self-lubiricating properties, by adding a polar solvent having affinity for polyamide-imide resin to the resin when it is blended with an imparter for wear resistance and an imparter for good fluidity.

CONSTITUTION: In preparing a molding material obtained by blending densely (A) 30W90wt% polyamide-imide resin with (B) 10W70wt% graphite and/or molybdenum disulfide as an imparter for wear resistance and (C) 0W30wt% resin selected from polyphenylene sulfide resin, polyamide resin, and aromatic polyester resin, having more improved fluidity than component A, as an imparter for good fluidity, 1W50pts.wt. polar solvent (e.g., N-methyl-2-pyrrolidone, DMF, or DMSO) having affinity for the three components based on 100pts.wt. total amounts of the three components. The solvent is removed from the mixture and it is blended under molten state, or the mixture is blended under molten state and the solvent is removed.