To assess the accumulation of some heavy metals in sediment and axillary species Lanceolaria sp. Thesamplesn collected in 5 sites along Cau River in Hai Duong province from May to December 2018were analysed for the concentration of Cu, Pb, Zn, Cd and Cr in sediment and Lanceolaria sp. Theresults showed the concentration of heavy metals in dried sediment samples, Cu: 17,333 - 66,601mg/kg
Pb: 21,208 - 196,470 mg/kg
Zn: 40,876 - 365,777 mg/kg
Cr: 29,357 - 120,046 mg/kg. Theconcentration of heavy metals in most sampling sites were in the TEC - PEC range as compared to US- EPA standards. The metal concentration in Lanceolaria sp. ranges from 7,408 - 37,492 mg/kg driedweight, equivalent to 0.917 - 5,021 mg/kg fresh weight. The biota-sediment accumulation factor (BSAF)in sediments decreases from: Cd >
Cu >
Zn >
Pb >
Cr. In which, Cd accumulation in Lanceolaria sp.collected along Cau River in Hai Duong province was relatively high (BSAF of only Cd was greaterthan 1). The results initially indicated that Lanceolaria sp. can be selected as an indicator organism tomonitor heavy metal pollution in the river sediments.Keywords: Heavy metals, Lanceolaria sp., sediment, Cau River, Hai Duong