As a part of the Phase I of JAERI/USDOE collaborative program on fusion blanket neutronics, the effect of constituents of the fusion blanket on tritium production rate distribution was examined experimentally by the Lithium-glass scintillator method. The self-shielding factor of the Lithium-glass scintillator was estimated by an experiment as well as a calculational method. The Li-glass method has shown excellent performance and reliability in the parametric measurement of the tritium production rate distribution.