The effects of several factors on dedifferentiation and redifferentiation of Pueraria lobata earthnut were studied.The results showed that the best disinfection way of Pueraria lobata stems with a bud was firstly treated with 70% ethyl alcohol for 30 seconds then treated with 0.1% HgCl2 for 15 minutes,and the optimum regeneration culture medium was MS+NAA 0.5mg/L + 6-BA 5.0mg/L.Liquid culture with sucrose 30g/L,pH 6.0,cultured in light at 25℃ gave a best result for high frequency plant regeneration of Pueraria lobata.