The effectiveness of metal accumulation in mangrove species is related to the root structure and diversity. This study aims to investigate the type of roots belong to Avicennia marina, Rhizopora mucronata and Sonneratia caseolaris in accumulating Cu and Zn from sediment and water. The samples consist of roots, water and sediment collected from 9 stations in Blanakan river. The heavy metals in samples were analyzed by using AAS. The Zn in A. marina, R. mucronata and S. caseolaris roots were 18.08-54.64 mg/ kg, 9.75-54.75 mg/ kg and 19.58-33.33 mg/kg. While, the Cu in A. marina, R. mucronata and S. caseolaris roots were 0.33-0.89 mg/ kg, 0.2-54.75 mg/ kg and 0.4-0.99 mg/kg. Related to the effectiveness of mangrove roots in accumulating metals which is measured by Transfer Factor (TF), it was found that R. mucronata has the highest TF. The TF of sediment-to-root for Zn in mangrove species is R. mucronata>S. caseolaris>A. marina. While, the TF of sediment-to-root for Cu is R. mucronata>S. caseolaris=A. marina. The TF ranges of R. mucronata for Zn is 0.30-0.38 and for Cu is 0.36-0.46. Hence, the R. mucronata with its unique prop root has significant potential in accumulating metals Cu and Zn from sediment.