Bisphenol A (BPA) in surface seawater and marine organisms in Laizhou Bay was analyzed by GC-MS in our research. The results showed that BPA was detected in the seawater of all the 29 sites and the concentrations ranged between 7.6~152ng/L, with the average concentration of 41ng/L. BPA concentrations in marine organism ranged between ND~13.6μg/kg. Bioconcentration factor (BCF) of BPA varied in different organisms. BCFs of Neverita didyma, Crangon affinis and Sardinella zunasi were 137, 133 and 124 respectively, higher than that of Platycephalus indicus and Pampus argenteus, which were 40.1, 45.6 respectively. In general, Laizhou Bay is already polluted by BPA, which may potentially bring about ecological problems.