The effects of humidity and temperature on the survival period of time and energy-consuming of juvenile Bufo melanostictus Schneider was investigated with 9 different humidity and temperature conditions. Results showed that the optimal humidity and temperature for their surviving is 24℃ in shallow water in which they can survive as long as 22 days while 32℃ high temperature with dry ambient is not suitable for their surviving. The results of their physical energy-consuming changes in different humidity and temperature also showed that the key factor that affects their survival time is not the food shortage but humidity and temperature.