Abstract: In order to find out the marine ecological environment of Zhuanghe temporary ocean dumping site and the influence to marine ecological environment by dumping, this paper combines the monitoring data from 2011 to 2013, with the methods of single factor index and comprehensive pollution index of water quality to evaluate the seawater quality; combines the monitoring data of 2012 and 2013, with the methods of single factor index and geological accumulation index to evaluate the sediment quality; analysises the diversity index by shannon-weaver exponential equation to evaluate the phytoplankton, zooplankton and large benthic quality of 2012 and 2013. At the same time we select a point which is outside the affective waters to compare with the monitoring datas. All the evaluation methods show that the water quality of the investigated area reached the second-class water quality from The Chinese National Standard of Seawater Quality; the sediment quality reached the first-class sediment quality from The Chinese National Standard of Sediment Quality; marine biological has not been spilled by the dumping obviously. These indicate that the marine ecological environment quality of Zhuang he is good. Dumping haven't impacted on the monitoring marine ecological environment of the monitoring area obviously.