Abstract: Influence of industrial waste water of Kunming Smeltery and Hongwei Paper Mill on chlorophyll a and b,β-carotene, and xanthophyll centents in Hydrilla verticillata L. was studied.The experiments showed that four pigments in different solutions of both waste water diluted are lower than those of the control. Chlorophyll a and b,andβ-carotene contents in the waste water of Kunming smeltery are much lower than those in the waste water of Hongwei Paper Mill, but the response of xanthophyll on both waste water is contrary.

Key words: Influence photosynthetic verticillatal