The cold resistance of eigth species of aquatic plants was measured by using the leaf electrolyte leakage and TTC reduction methods with various levels of low temperature treatment. A sequence of the increasing cold tolerance was given as. L.minor, N.officinale, P,heteroclada, M.spicatum, S.anglica, E.crassipes, A. philoxeroioles, P.stratiotes, Both L.minor and N.officinale may be used in winter in ecological engineering for wastewater treatment. The above result was verified by damage symptom observation a...