Abstract:The effects of different ingredients and stabilizers on the stability of acidic milk drink which was in the PET bottle was studied . The study found that whey protein powder and guar gum greater were the most im－ portant influence factors of the stability of the product. The stabilizer ratio was the most impotent thing for the stability of the product， and the bese stabilizer ratio had been found by the orthogonal experiment. The viscosity of the product was 22 cp， and the stability testing and observation results were the best， and then the rheological test curve was normally.