The accelerator driven subcritical system(ADS)is a new type of nuclear energy system.A standard ADS is composed by three elementary components,namely,a high energy and intensity proton beam,a spallation target and a subcritical core.It is regarded as one of the promising technique means to reduce the long-lived radioactive waste inventory.Meanwhile,it shows the potential for fuel breeding and power generation.China has been committed to the ADS research for a long time,making some dramatic breakthroughs in some key technologies.China Initiative Accelerator Driven System(CIADS)led by the Chinese Academy of Sciences is one of the Major National Science and Technology Infrastructures during\the 12thfive-year plan"supported by National Development and Reform Commission of China and expected to be the first ADS verication facility in the world.