Taking biennial Echinocactus grusonii as material，it was under water-induced treatment at different temperatures after it was removed the old root，to explore the influences of Echinocactus grusonii rooting under different temperatures；added activated carbon and copper sulfate to found the control effect of green algae under two methods after Echinocactus grusonii hydroponic rooting.The results showed that the water-induced Echinocactus grusonii rooting root growth under 20℃/13℃，25℃/15℃，30℃/16℃，35℃/18℃ treatments，as the temperature rose，Echinocactus grusonii rooting was earlier and faster,root length was longer；under 35℃/18℃ treatment was the earliest，fastest and longest；the Echinocactus grusonii rooting was under 40℃/20℃ and 45℃/23℃ treatments water-induced was less than under 35℃/18℃，as the temperature rose，Echinocactus grusonii rooting was later,root length was shorter.The Echinocactus grusonii rooting under activated carbon treatment of 3 g/300mL neither affect Echinocactus grusonii normal root and grow，also had good control effect to algae.