The contents of 16 priority polycyclic aromatic hydrocarbons(PAHs) in the seven tissues of three species emergent mac-rophytes from five sampling sites in Small Baiyangdian Lake nearby Duancun Village were measured by GC-MS. The PAHs distri-button, composition, and their determining factors were analyzed. The following results were obtained;(1)the total dry-weightcontents of 16 priority PAHs(PAH16)ranges From 82.5 to 448.6ng/g(dw),with the average contents of 448.6ng/g(dw) in lotusleaves, 129.3 ng/g(dw) in lotus stems,292.6ng/g(dw) in cattailleaves,166.8ng/g(dw) in cattail stem, 82.5ng/g(dw) in cat-tail mots,141.Sng/g(dw) in reed leaves and 90. Ong/g(dw) in reed roots. This shows that highest contents are in leaves, followedby stems and roots. The significant positive relations among the contents of PAHsc:ongeners in seven macrophytes tissues are o6-served, implying the very similar PAHs distribution patterns among seven tissues. (2)Of 16 priority PAHs, lower molecular weightPAHs are dominant with the percentages varying from 66. 2%(in lotus leaves) to 89%(in cattail stems),while the percentagesof moderate and higher molecular weight PAHs range from 10.2%(in cattail stem,) to 32.6%(in lotus leaves) and from 0.60/(in cattail leaves) to 3.70/(in reed roots).Six PAH congeners including phenanthrenr(Phe),fluoranthene(Fla),naphtha-lene(Nap),fluorine(Flo),pyrene(Pyr) and chrysene(Chr) are dominant components with average percentages of 35.3%,15.5%,12.1%,11.70%, 9.2% and 5.2%, standing for 89% of total 16 priority PAHs(P.AH₁₆).3)PAHs contents in emergentmacrophytes are observed to be significant positive relations with their lipid percentages, and to be significant negative relations with the octanol-water partition coefficient (K_owand octanol-air partition coefficient(K_ow)of PAH congeners.