TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The particle size of polymer colloid micro-sphere with smaller particle size is 100-200 nm, preferably 125-173 nm, 130-173 nm or 125-130 nm. The particle size of polymer colloid micro-sphere with larger particle size is 600-900 nm, preferably 669-887 nm. The evenly-mixing method is a ultrasonic method. The volume concentration ratio of the two polymer colloid micro-spheres with different particle sizes is 0.006-0.059:1, 0.006-0.025:1, 0.006-0.013:1, 0.015-0.029:1, 0.015-0.030:1, 0.013-0.025:1, 0.029-0.059:1 or 0.030-0.059:1. The polymer colloid micro-sphere is polystyrene colloid micro-sphere or poly methacrylate colloid micro-sphere. In the ultrasonic method, where the time is 20-30 minutes and the energy is 120-180 J. The hydrophobic treatment in step (iii) is carried out by placing the glass sheet in the mixed solution C composed of aqueous concentrated sulfuric acid solution and aqueous hydrogen peroxide solution, washing by de-ionized water after ultrasonic treatment and blow-drying by nitrogen. The concentration of aqueous concentrated sulfuric acid solution is 98 mass-%, the concentration of aqueous hydrogen peroxide solution is 30 mass-% in the mixed solution C. The volume ratio of aqueous concentrated sulfuric acid solution to aqueous hydrogen peroxide solution is 3:1 in the ultrasonic treatment of hydrophobic treatment, where the time is 5-10 minutes and the energy is 30-60 J. In step (iii) the area of glass sheet is 1-4 sq.cm, the volume of each drop of the mixed solution B is 10-30 mu l, where the dispersing time is 30-60 seconds in the aqueous surfactant solution and the surfactant is lauryl sodium sulfate or lauryl sodium sulfonate, where the concentration of aqueous surfactant solution is 1-3 mass-% and the dosage is 0.5-1 ml. In step (iii) the binary colloid crystal film floating on aqueous surface is processed by adding deionized water in the system of the step (iii) to raise liquid level, after removing the glass sheet, inserting the substrate and removing to bottom of the binary colloid crystal film and lifting the substrate and transferring the binary colloid crystal film as a whole to the substrate, after drying, obtaining the binary colloid crystal film, where the substrate is glass sheet, silicon sheet or metal and the metal is preferably aluminum. Preferred Process: The method for preparing binary colloid crystal film comprises, either, method A which includes, (i) mixing the emulsions of polystyrene colloid micro-sphere with particle size as 130 nm and 887 nm in volume concentration ratio of 0.006:1, 0.013:1 and 0.025:1 and processing ultrasonic treatment for 20 minutes under condition ultrasonic energy as 120 J to obtain mixed solution A; (ii) adding ethanol with same volume in the mixed solution A and processing ultrasonic treatment for 30 minutes under condition ultrasonic energy as 120 J to obtain mixed solution B; (iii) processing hydrophobic treatment to 1 cmx 1 cm glass sheet and placing in center of dried container, adding deionized water to reach upper surface of the glass sheet but not submerge the upper surface, dripping the drops of 20 mu L of mixed solution B on surface of the glass sheet after 50 seconds, after the two polymer colloid micro-spheres with different particle sizes in the drops are completely dispersed to steam interface, adding 0.5 ml of aqueous lauryl sodium sulfate solution with concentration as 2 mass-% to obtain the binary colloid crystal film floating on aqueous surface; (iv) adding deionized water in system of the step (iii) to raise liquid level, after removing the glass sheet, inserting the substrate and removing to bottom of the binary colloid crystal film and lifting the substrate, and transferring the binary colloid crystal film as a whole to the substrate, after drying, obtaining the binary colloid crystal film, where the substrate is glass sheet, silicon sheet or metal and the metal is preferably aluminum; and method B, which comprises: (i) mixing the emulsions of polystyrene colloid micro-sphere with particle size as 173 nm and 887 nm in volume concentration ratio of 0.015:1, 0.029:1 and 0.059:1 and processing ultrasonic treatment for 30 minutes under condition ultrasonic energy as 180 J to obtain mixed solution A; (ii) adding ethanol with same volume in the mixed solution A and processing ultrasonic treatment for 30 minutes under condition ultrasonic energy as 180 J to obtain mixed solution B; (iii) processing hydrophobic treatment to 1 cm x 1 cm glass sheet and placing in center of dried container, adding deionized water to reach upper surface of the glass sheet but not submerge the upper surface, ripping the drops of 30 mu l of mixed solution B on surface of the glass sheet, after 60 seconds, after the two polymer colloid micro-spheres with different particle sizes in the drops are completely dispersed to steam interface, adding 1 ml of aqueous lauryl sodium sulfate solution with concentration as 2 mass-% to obtain the binary colloid crystal film floating on aqueous surface; (iv) adding deionized water in system of the step (iii) to raise liquid level, after removing the glass sheet, inserting the substrate and removing to bottom of the binary colloid crystal film and lifting the substrate, and transferring the binary colloid crystal film as a whole to the substrate, after drying, obtaining the binary colloid crystal film, where the substrate is glass sheet, silicon sheet or metal and the metal is preferably aluminum; or a method C, which comprises: (i) mixing the emulsions of polystyrene colloid micro-sphere with particle size as 125 nm and 669 nm in volume concentration ratio as 0.015:1, 0.030:1 and 0.059:1 and processing ultrasonic treatment for 30 minutes under condition ultrasonic energy as 150 J to obtain mixed solution A; (ii) adding ethanol with same volume in the mixed solution A and processing ultrasonic treatment for 30 minutes under condition ultrasonic energy as 150 J to obtain mixed solution B; (iii) processing hydrophobic treatment to 1 cm x 1 cm glass sheet and placing in center of dried container, adding deionized water to reach upper surface of the glass sheet but not submerge the upper surface, dripping the drops of 10 mu L of mixed solution B on surface of the glass sheet, after 30 seconds, after the two polymer colloid micro-spheres with different particle sizes in the drops are completely dispersed to steam interface, adding 2 ml of aqueous lauryl sodium sulfonate solution with concentration as 2 mass-% to obtain the binary colloid crystal film floating on aqueous surface; (iv) adding de-ionized water in system of the step (iii) to raise liquid level, after removing the glass sheet, inserting the substrate and removing to bottom of the binary colloid crystal film and lifting the substrate, and transferring the binary colloid crystal film as a whole to the substrate, after drying, obtaining the binary colloid crystal film, where the substrate is glass sheet, silicon sheet or metal and the metal is preferably aluminum. In the method A, the polystyrene colloid micro-sphere emulsion with particle size as 130 nm, which is prepared by method, under protection of nitrogen, using 250 ml of de-ionized water as dispersing medium, mixing 5 ml of styrene, 0.05 g of potassium per-sulfate and 0.1 g of lauryl sodium sulfate to process soap-free emulsion polymerization in water bath with temperature as 60 degrees C, the mechanical agitating speed is 350 rpm, after reacting for 24 hours, obtaining polystyrene colloid micro-sphere emulsion with particle size as 130 nm, where the polystyrene colloid micro-sphere emulsion with particle size as 887 nm is prepared under protection of nitrogen, using 250 ml of de-ionized water as dispersing medium, mixing 37.5 ml of styrene and 0.2375 g of potassium per-sulfate to process soap-free emulsion polymerization in water bath with temperature as 60 degrees C, where the mechanical agitating speed is 350 rpm, after reacting for 24 hours, obtaining polystyrene colloid micro-sphere emulsion with particle size as 887 nm. The hydrophobic treatment of glass sheet by placing glass sheet in mixed solution C composed of 98 mass-% of aqueous concentrated sulfuric acid solution and 30 mass-% of aqueous hydrogen peroxide solution in volume ratio as 3:1, processing ultrasonic treatment for 5 minutes under condition ultrasonic energy as 30 J, washing by deionized water and blow-drying by nitrogen to finish the hydrophobic treatment of glass sheet. In method B, the polystyrene colloid micro-sphere emulsion with particle size as 173 nm which is prepared under protection of nitrogen, using 250 ml of deionized water as dispersing medium, mixing 10 ml of styrene, 0.05 g of potassium per-sulfate and 0.1 g of lauryl sodium sulfate to process soap-free emulsion polymerization in water bath with temperature as 60 degrees C, the mechanical agitating speed is 350 rpm, after reacting for 24 hours, obtaining polystyrene colloid micro-sphere emulsion with particle size as 173 nm where the polystyrene colloid micro-sphere emulsion with particle size as 887 nm is prepared under protection of nitrogen, using 250 ml of deionized water as dispersing medium, mixing 37.5 ml of styrene and 0.2375 g of potassium per-sulfate to process soap-free emulsion polymerization in water bath with temperature as 60 degrees C, where the mechanical agitating speed is 350 rpm, after reacting for 24 hours, obtaining polystyrene colloid micro-sphere emulsion with particle size as 887 nm and the hydrophobic treatment of glass sheet is by placing glass sheet in mixed solution C composed of 98 mass-% of aqueous concentrated sulfuric acid solution and 30 mass-% of aqueous hydrogen peroxide solution, processing ultrasonic treatment for 10 minutes under condition ultrasonic energy as 60 J, washing by de-ionized water and blow-drying by nitrogen, to finish the hydrophobic treatment of glass sheet, where the volume ratio of 98 mass-% of aqueous concentrated sulfuric acid solution to the 30 mass-% of aqueous hydrogen peroxide solution is 3:1. In method C, the polystyrene colloid micro-sphere emulsion with particle size as 125 nm is prepared under protection of nitrogen, using 250 ml of deionized water as dispersing medium, mixing 5 ml of methyl acrylate, 0.05 g of potassium per-sulfate and 0.1 g of lauryl sodium sulfate to process soap-free emulsion polymerization in water bath with temperature as 60 degrees C, where the mechanical agitating speed is 350 rpm, after reacting for 24 hours, obtaining polystyrene colloid micro-sphere emulsion with particle size as 125 nm and the polystyrene colloid micro-sphere emulsion with particle size as 669 nm is prepared under protection of nitrogen, using 250 ml of de-ionized water as dispersing medium, mixing 25 ml of methyl acrylate and 0.125 g of potassium per-sulfate to process soap-free emulsion polymerization in water bath with temperature as 60 degrees C, where the mechanical agitating speed is 350 rpm, after reacting for 24 hours, obtaining polystyrene colloid micro-sphere emulsion with particle size as 669 nm and the hydrophobic treatment of glass sheet is by placing glass sheet in mixed solution C composed of 98 mass-% of aqueous concentrated sulfuric acid solution and 30 mass-% of aqueous hydrogen peroxide solution, processing ultrasonic treatment for 10 minutes under condition ultrasonic energy as 60 J, washing by deionized water, and blow-drying by nitrogen to finish the hydrophobic treatment of glass sheet, where the volume ratio of 98 mass-% of aqueous concentrated sulfuric acid solution to the 30 mass-% of aqueous hydrogen peroxide solution is 3: 1.