Abstract: Surface seawater samples were collected to study the concentration and pollution characteristics of seven heavy metals (Cu, Pb, Zn, Cd, Cr, Hg and As) in the area at 48 sites in the offshore area of Honghai bay in May and November 2015. The heavy metals pollution condition was evaluated using water pollution index and combined pollution index, and the coefficient of variation (CV) method was used to analyze the dispersion degree of pollutants in spatial scale, and the correlation analysis and PCA method were used to analyze the main sources of heavy metals pollutants. The results showed that the average concentrations of Cu, Pb, Zn, Cd, Cr, Hg and As met the second grade of seawater quality standard. The Single Factor Pollution Index (SFPI) values of seven metals were in the following order:Zn > Pb > Cu > As > Cd > Cr > Hg. The evaluation result of the combined pollution index method showed that the index grade was relatively low and the value had little difference, so the study area was clean. The results of coefficient of variation (CV) showed that the spatial dispersion of heavy metal content in the investigated area was large, and the sources of heavy metal pollutants in the studied sea area were different. The results of correlation analysis and principal component analysis indicated that the correlation coefficients of Cu, Pb, Zn, Cd, Cr, Hg and As were relatively small, and the first three principal components had lower positive load of heavy metals. Therefore, there were no similar pollution levels or same sources between seven metals, that is, the probability of the same sources was lower among the elements.