The effect of Ni₃Al on Ni grain growth inhibition were investigated by sintering experiment of MCFC porous Ni-base anode made of 4-10 wt% Ni₃Al intermetallic compound. Ni grain growth is retarded and Ni grain maintains small uniform size for Ni₃Al particle's pinning effect on Ni grain boundary movement and surface area reduction by surface diffusion between Ni particles. It is found that the Ni grain growth rate of porous anode included Ni₃Al follows the following kinetic law, G - G₀=Kt^m with m=0.22 which is lower value compared with that of pure Ni anode and the pore size is 3 to 6 μm compatible with the electrochemical reaction of the MCFC.