Abstract: Based on the preliminary parameters of fusion reactor, the calculation model with 20° range was built for the solid blanket including the first wall armor, the first wall cooling plate, the tritium breeding region and the support structure. Li₄SiO₄ and Li₂O were adopted as tritium breeder material, respectively. By using code MCNP, the influence of structure and ⁶Li enrichment on tritium breeding ratio was studied. The results show that ⁶Li enrichment in the range of 30% to 80% is suitable, the beryllium armor of first wall leads to increase of the tritium breeding ratio, and the thickness of first wall cooling plate should not exceed 3 cm to avoid negative effect on tritium production.