The CIADS accelerator will be developed by the collaborations between Institute of Modern Physics(IMP)and Institute of High Energy Physics(IHEP).The demonstrative project is divided into three stages.Firstly,a research facility including a superconducting 500 MeV 5 mA CW proton linac with a test reactor will be built with a reactor power of 10 MW by the year 2 022.At this stage,the critical technologies will be tested and the prove principle system will be synthesized.At stage 2,most of the challenges will hopefully be resolved and the energy of the linac will be increased to 1 GeV at 10 mA with a reactor power of 100 MW for an operational demonstration ADS system.Finally,a 1.5 GeV CW accelerator with beam current of 10 to 25 mA plus a 1 GW reactor commercial prototype system will be built for the performance studies of the daily operation.