This paper describes design considerations on the tritium processing and the tritium laboratory in the International Fusion Materials Irradiation Facility (IFMIF) that is being developed for neutron irradiation testing of candidate fusion materials. In the IFMIF the tritium is generated by various reactions. However, the irradiated materials will have high activities. The tritium processing method is designed on the basis of the evaluation for tritium source and generation rate. The tritium laboratory for post irradiation examination (PIE) of the activated/tritium contaminated materials is evaluated.