Abstract: Lonicera japonica var. chinensis and L.fragrantissima potted plants were used to study their physiological response and salt tolerance under NaCl stress. The results showed that the electrical conductivity and MDA content increased with the increasing of salt concentration in both species. There was no obvious rise of H₂O₂ content in L. japonica var. chinensis, while a higher level of H₂O₂ content in L.fragrantissima was observed than control. There was a significant generating rate of superoxide radical(O^-_{· 2})at early stage of salt stress in L. japonica var. chinensis, but the time was later than superoxide radical in L.fragrantissima. For L. japonica var. chinensis,the activities of SOD, APX, and CAT increased and then decreased, while the POD activity showed a constant increase during stress process. For L.fragrantissima, the SOD activity increased slightly during NaCl stress, however, the activities of APX and CAT increased first and then decreased. No obvious POD activity increment was detected, only a significant increment was observed under at the end of 100 mmol/L NaCl stress. These results suggested that the two Lonicera species could employantioxidant enzymes to eliminate ROS under salt stress. Meanwhile, the salt tolerance of L. japonica var. chinensis was better than that of L.fragrantissima by rapidly increasing the activities of antioxidant enzymes to decrease the lipid peroxidation level and reduce ROS damage.