Vaccines are sensitive to environmental temperature. Potency can be adversely affected if vaccines are left out too long or exposed to various temperature excursions (out-of-range temperatures) that could have a cumulative negative effect. In order to survey the quality of marketed Pneumococcal Polysaccharide Conjugate Vaccine in Taiwan, a total of 23 samples were collected by the local health authorities from hospitals, clinics and manufacturers in various counties from January to August, 2012. Samples were analyzed by test methods specified by manufacturers. The results showed that the potency and completeness of adsorption of all samples met the approved criteria.