Introduction  There will be lot of foam in seawater discharge from seawater desulphurization coal-fired power plants， which will have adverse effects on environmental vision. In order to meet the requirements of environmental permit in Vietnam， foam need to be eliminated.

  Method  Through observing and analyzing mechanism of seawater foam generation about CW cooling after seawater FGD and aeration basin，and did some tests. It was proposed a scheme of centralized physical spray scheme to defoaming.

  Results  The results we obtained demonstrate that this scheme is easy for construction and maintenance without stopping operation， bringing more obvious effect with less investment . There is no need to use chemicals for defoaming， which does not increase the risk of chemicals to seawater.

  Conclusion  This scheme provides a good reference for foam defoaming of seawater discharge in similar coal-fired power plants.