A SiC assembled large block for blast furnace tuyeres was prepared using silicon carbide particles (3-1 and 1-0.088 mm) and fine powder (<0.088 mm), silicon powder (<0.088 mm), industrial carbon black (N990), microsilica, ρ-Al2O3 powder, etc. as raw materials. The developed block was compared with a silicon nitride bonded silicon carbide brick, a self-bonded silicon carbide brick and an imported self-bonded silicon carbide block to analyze and evaluate their service performance.