Based on the investigation data of Cadmium (Cd) in Jiaozhou Bay waters in1981, this paper analyzed the content, distribution and sources of Ca in Jiaozhou Bay. Results showed that the contents of Cd were lower than 1.00μg·L~(-1) in the full year, as reached Grade I in according to National Standard of China for Seawater Quality (GB3097-1997). There were two major sources for Cd. One was atmosphere precipitation; another was land pollution from the major rivers, played the major role in spring and summer, respectively. While in autumn, both atmosphere precipitation and land pollution decreased, and there was little Cd pollution in the Bay.
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