Accelerator driven system (ADS) is the effective tool for transmuting the long-lived transuranic radionuclidesinto shorter-lived radionuclides. A project called C-ADS is being studied at the Chinese Academy of Sciences.Injector II prototype of C-ADS which is in charge of by the Institute of Modern Physics has already gained agood progress so far. Two superconducting solenoids with the effective length of 150 mm have been designed andfabricated by Magnet and Mechanical Group of IMP and installed into the testing cryomodule[1].