In an attempt to understand whether commerical cola-drinks had contain phosphoric acid, one hundred and nine Samples were puchased from market and analyzed during Sept 1986 through June, 1987. The results show that two samples were formd undetectable, whereas others contained phosphoric acid between 0.01~0.99g/kg. Among them 5 samples (4.6%). exceded the permitted allowance (less than 0.6g/kg)