Through the pot experiment, 3 lead pollution levels were set in small water bodies under static simulation of natural conditions. The purification ability and resistance physiological characteristics of different concentrations of lead-contaminated water were studied in Arundo donax, Acorus tatarinowii, Iris tectorum. The results show that among different concentrations of lead-contaminated water, Acorus tatarinowii has the best growth, and its plant length and stem length are the highest, reaching 61.17 cm and 41.23 cm. Arundo donax have the best root length with a value of 21.23 cm.

The root activity of the 3 aquatic plants shows as Arundo donax > Acorus tatarinowii > Iris tectorum. In the water polluted by low concentration and high concentration of lead, the content of chlorophyll a in Acorus tatarinowii is higher than that in Arundo donax and Iris tectorum. The content of chlorophyll b in Iris tectorum is higher than that in Arundo donax and Acorus tatarinowii. The content of chlorophyll a, chlorophyll b and total chlorophyll of 3 aquatic plants are the highest. The purification capacity of Arundo donax decreases with the increase of lead concentration. In general, Arundo donax, Acorus tatarinowii and Iris tectorum have adaptability and purification effects on water polluted by different concentrations of lead. Acorus tatarinowii has strong adaptability, and Arundo donax has the best purification effect.