The process of alkanes transport into cells and the effect of transport selectivity on priority of different alkanes in hiodegradation were studied. An alkane transport experiment based on emulsion of alkanes shows that the inclusive alkanes in cells increase steadily in 18 hours during incubation with alkanes. The transport efficiency for each of the specific alkanes does not show remarkable difference, while for mixtures of alkanes, a signifi cant selectivity exists in the competitive transport experiment. The Selective factor of hexadecane, heptadecane, eicosane and heneicosane are 1. 468, ...