Objective To have knowledge about the bacterial pollution of beverages available in the market and main constituents of unqualified beverages in an attempt to provide new ideas for making beverage.Method Microbiological index in beverages of 31well-known brands（a total of 155beverages）available in the market was detected using the pour plate method.Results Qualification rate of total colonies was 90.3%

while that of coli group

mold

saccharomycete and other groups of pathogenic bacteria was all 100.0%.Total colonies in soda water

acidic beverages detected were both unqualified

and main constituents of beverages with unqualified total colonies were water

carbon dioxide

baking soda and citric acid etc.Conclusion Microbiological index in most beverages available in the market is qualified

and some constituents of beverages can effect the growth and reproduction of microorganism.Adding appropriate vitamin C and probiotics to formula of the beverage can not only extend the shelf life

but also improve human health.