Based on investigation data on Pb in surface and bottom waters in Jiaozhou Bay, eastern China in 1985, we analyzed the spatial and seasonal variations Pb in waters, and defined the seasonal distribution, horizontal distribution, variation range, vertical variation, vertical transfer process and high sedimentation rate region. Results showed that, the seasonal variations of Pb contents in surface and bottom waters were consist that Pb contents were in order of autumn<spring<summer. In spatial

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... le, Pb contents in surface and bottom waters were consist. In variation scale, the variation ranges of Pb contents in surface and bottom waters were closed. In vertical scale, Pb contents in surface and bottom waters were consist. In regional scale, Pb contents in bottom waters in the bay mouth were relative high, and high sedimentation rate was occurring in this region. We found that Pb contents in Jiaozhou Bay were determined by precipitation. This research confirmed the vertical transfer process that Pb could be settling to the bottom by force of gravity and current.