Bioconcentration of tetrachlorobenzene (TeCB) inChlorella marine, Nannochloropsis oculata, Pyramidomonas sp.,Platymonas subcordiformis, andPhaeodactylum tricornutum; and toxicity of TeCB to the marine algae were tested. Values of bioconcentration potential parameters, including uptake rate constantk1, elimination rate constantk2 and bioconcentration factorBCF, were obtained not only from the time course of TeCB uptake by the marine algae by using a bioconcentration model, but also from the acute toxicity test data for percent inhibitionPI(%)∼exposure concentration of TeCB-time by using a combined bioconcentration and probability model. The results showed good relationship betweenk1(TOXIC) andk1(UPTAKE) andk2(TOXIC),k2(UPTAKE), andBCFD(IOXIC) andBCFD(UPTAKE). Especially, the values ofBCFD(TOXIC) were well consistent with those ofBCFD(UPTAKE).