Abstract: In this study, the amounts of Hg and As in surface sediments of Weitou bay in 2008 and 2017 were examined to assess their spatial distribution, contamination level and potential ecological risks. The results revealed that the concentration levels of Hg in surface sediments of Weitou bay declined while As raised in the last decade. This pattern was consistent with the changes of the concentration levels of Hg and As in seawater and benthic organisms. The geo-accumulation indices of Hg and As were less than 0, and the overall pollution load index was less than 1, which indicated that the sediments of Weitou bay were clear of Hg and As contamination. Additionally, the ecological risk level was low in Weitou bay depended on the potential ecological risk indices of Hg and As were less than 40. According to the evaluation of spatial distribution, the amounts of Hg and As in surface sediments were associated with the geographic advancement. In 2008, the high-value regions were located mostly in inner bay. In 2017, with the implementation of the environmental remediation and marine restoration in inner bay, the amounts of Hg and As has declined. The high-value regions have been relocated to the southeast side of outer bay along the coast of new industrial estate.