[en] In the condition of tritium treatment, it always involved detritiation for tritium permeation or even leakage. The purification system was designed for glove box in tritium fuel cycling during normal condition and emergency. Tritium gas is pumped from glove box into the detritiation system, passing through the beforehand capture and the mixer, entering the oxidation catalyze bed, the tritium gas is oxidized into HTO, the HTO vapor is brought out from the reactor by gas, passing through the cooler, and then the HTO is wiped off by adsorbent. The concentration of tritium out of the adsorbent bed is detected by the on line tritium detector. If the concentration of the tritium is beyond the exhausting limit, the tritium gas will be sent into the glove box and treated until it is below the limit, and it could be exhausted. If the gas atmosphere is inert gas (such as Ar) atmosphere, small oxygen will be added into the mixer. If the tritium concentration is very low, hydrogen gas will be added into the mixer to accelerate the reaction. The treatment ability of the purification system is shown as follows: in the flow rate range 0-6 m³/h, one way catalyzed oxidation ability of H2 is higher than 98%.When the system is used to deal with 0.4% (VN) H2 in 300 L air, it could reduce the H2 concentration of gas to 1/10 of the beginning in 5.4 min and 1/1000 of the beginning in 20 min.The purification results of tritium gas is shown in Table 1.The tritium waste gas is enclosed in a 1 m³ pot, and the tritium gas is purified circularly with the purification system, the flow rate is 60 L/min, it can be see that the purification system is very efficient. (authors)