Soft rot is a bacterial disease of widely existing and being very serious on Amorphophallus Blume. In order to control the spreading of pathogens on the parent corm, a new disinfected method by immersing with constant temperature had been development for the bacteria not resisting high temperature, and a comparative study among the new method, conventional agricultural methods by spraying streptomycin and spraying formaldehyde had been conducted. The results showed that the pathogens lost activity by immersed at 55℃ for 10 min, and the germination was not affected. After 28 days of the parent corm carried pathogen on surface was disinfected, the incidence was only 12% by immersing at 55℃ for 10 min, while it was as high as 46.7% and 56.0% by spraying 1% of formalin solution and 5×105 U/L of streptomycin, and the differences were significant at 5% level. However, the incidence by the two latter methods were less than 65.3% of CK, but no significant. After disinfected the infected corm, the control effect was 94.7% by the former, which was far higher than by the formaldehyde (63.2%) and streptomycin (59.2%). In addition, southern blight and konjac aphids were killed by high temperature. It may be concluded that the new disinfected method was efficient, safe and broad, and would greatly contribute to the konjac diseases controlled.