Some environmental behavious of cetane were studied using the tracing technique of ¹⁴C-cetane, rice pot culture and sequential solvent extraction method. Results showed that cetane entered easily into rice plant and accumulated in rice grain, thus giving harmful effects on human health. Existing forms and metabolic process of ¹⁴C-cetane in soil and rice were also studied. ¹⁴C originated from cetane maily existed as solvent-extracted form (about 39% of all ¹⁴C), and second one in undecomposed remains of plants (about 25%) and fulvic acid (about 23%) in soil. ¹⁴C existing as carbonat was about 10%. ¹⁴C entering in humic acid (include humin) was less (about 3%). Cetane mainly existed as bound residue in rice, with amount being 98% of all ¹⁴C in plant. The organic solvents-extracted (petroleumether, ether and ethanol) amount was 2%. The shorter the time passed after cetane addition in rice system, and the less the form of bound residues,the more the petroleum etherextracted part.Polar metabolites with a bigger R_f-value accounted for 21% solvent extracted part.