Based on the CECE-GC experimental system,  with a disposal capability of 10 t/a of tritiated heavy water,   the demonstration experiment of recovering deuterium from light water containing deuterium and the simulation operation of recovering tritium from tritiated heavy water with tritiated light water are introduced.  The system has been operated for 240 h.  The total concentration factor of CECE is about 4,  and the separation factor of tritium is around 10.  The 8m³ /d GC system has recovered 90 % hydrogen from 10.5 m³ tritiated hydrogen in 23 h,   the tritium is depleted to more than 1 000 times.   This experimental system is an important basis for further engineering research.