Objective To investigate the current situation of aluminum contamination in foods caused by using aluminium potassium sulfate (aluminum ammonium sulfate) in food processing，and to provide basic data for determining the level of contamination. Methods After drying and ashing samples and making the sample solution to a constant volume, the levels of aluminum were determined with chrome azurol S by spectrophotometry. The residues of aluminum were calculated as the content of aluminum in dry samples. Results A total of 194 samples were determined, the contents of aluminum are in the range of <5.00-10522 mg/kg, and the rate of samples exceeding hygienic standard is 45.4%. Conclusion Problems of aluminum contamination in deep-fried dough cake, deep-fried dough sticks, vermicelli noodles, vermicelli sheets and jelly fish were existed, and high attention should be paid by food regulatory authorities and consumers.