Residual pollution site is just introduced in Vietnam within the past few years, although the presence of the residual pollution site was reported to appear for a long time. The causal of the residual pollution site is very difficult to solve and normally, it is only detected just when the contaminants from the site entered the food-chain and directly threaten to public health. Up to present, there is no clear definition that is accepted and wiely disseminated for the residual pollution site in Vietnam. There is not fully investigation to identify and assess the contamination level of the residual pollution site as well. The research presented the initial work for construction of an index used to identify and assess the contamination level of the residual pollution site, in order to form the legislation base of a proper management system for the residual pollution site.