The flow towards the coast will carry heavy metals that enter water bodies, and it can cause Zinc (Zn) pollution in coastal areas. One of the efforts to overcome this problem is the use of mangroves as phytoremediation agents. Mangroves can absorb and accumulate heavy metals in the environment into their bodies. These research locations were at Mangrove Wonorejo Ecoforest. The purposes of this study were to determine the dynamic system of Avicennia marina's ability at the Wonorejo Ecoforest to accumulate Zn by determining the value of the bioconcentration factor (BCF) and the value of the translocation factor (TF). Samples were taken in the form of water, sediment, roots, stems, and leaves of A. marina, and those were analyzed for Zn concentration using an atomic absorption spectrophotometer (AAS). The results showed that the average Zn concentration in water was 0.003 mg/L - 0.0044 mg/L. The average Zn concentration in the sediment was 55.11 mg/kg - 59.45 mg/kg. The concentration of Zn in the sediment was higher than in water. It indicated that Zn was deposited in the sediment. Based on the dynamic system, the Zn concentration in sediment, BCF, TF were influence each other. In conclusion, A. marina has the potential to be a phytoremediation plant in the coastal area.