To obtain a melamine fiber product that has a chambray tone appearance and good fabric hand by dying a fabric blend product substantially comprising a melamine fiber and a substantially undyeable fiber in the dyeing bath.

The melamine fiber product that comprises a blend of 20-100 wt.% of melamine fiber with a substantially undyeable fiber in the dyeing bath as aramide fiber, glass fiber, carbon fiber, poly(amide)imide fiber or ceramic fiber in the form of woven fabric, nonwoven fabric or knitted fabric is dyed in a dyeing bath containing 1 or more kinds of dyes selected from the group consisting of direct dyes, acidic dyes, metal-containing acidic dyes and dispersion dyes at a temp. of 95-150°C, preferably in a dispersion dye bath at a temp. of 110-150°C to give the objective dyed product having Chambray tone appearance. Or, blend fabric of protein fiber as wool or silk with melamine fiber are dyed in a bath containing 1 or more kinds of dispersion byes at a temp. of 95-110°C.