Abstract: In order to load and unload spent fuel assemblies safely in NPP,the ancillary equipment for spent fuel transport used to perform fluid transfer activities such as water feeding,air charging,and cask drying and heat rejection.This paper introduces the requirements,the scheme and the principle of the ancillary equipment,which adopts centralized-control and modular design,and have the performances such as higher work efficiency,higher safety,less radioactive substance accumulation and friendly man-machine conversation.