Several different drinks(green tea drinks,milk,mandarin orange drinks,restituted-milk,milk tea)from various manufacturers in distinct areas were found deteriorated,with pH decrease,swell bottle,and gas production.The 11 typical bacteria were isolated and analyzed by 16S rDNA sequence,and identified as Enterobacteriaceae bacteria.Among them,3 isolates from mandarin orange drinks and milk tea were further identified as Enterobacter cloacae by rpoB sequence Balst.The bacterium of Enterobacteriaceae isn't heat-resistant.Those isolates were also proofed to have post after sterilization.Many species of Enterobacteriaceae are food-borne pathogens.On-the-spot inspection proofed that those bacteria polluted came from water(cooling water or flash water) or moist air.