The feasibility of aluminum deposition on inner wall of waveguide by atomic layer deposition was studied. First, by solving adsorption kinetics equation based on gas on the pipe inner wall, the time for the reactant to reach saturated adsorption on the basis was calculated. Then, according to the aluminum crystal structure, the thickness of each deposition cycle was obtained. Finally, the minimum aluminum thickness and number of atomic layer deposition cycles that can meet electromagnetic requirement of wave guide was calculated.