The pore structure of air electrode has an important effect on the performance of lithium air battery. Therefore, based on the Comsol software platform, this paper developed a one-dimensional nonaqueous lithium air battery electrochemical model, and found that the simulation results by the present model are closer to the experimental results than those by the previously published model. What is more, the present model is widely used to investigate the effect of the air electrode porosity and its distribution, the particle size of porous carbon used to make the solid skeleton of air electrode, solid skeleton and pore phase tortuosity on the performance of lithium air batteries. The simulation results show that the air electrode porosity increasing, the discharge voltage platform and the capacity of nonaqueous lithium air battery increase. If the average porosity of the air electrode with the randomly porosity along the thickness direction is the same as the air electrode with the constant porosity, the discharge voltage platform and the capacity of the nonaqueous lithium air battery prepared by the air electrode with the randomly porosity are higher than the air electrode with the constant porosity. The results also show that the particle size of porous carbon decreasing, the discharge voltage platform of the nonaqueous lithium air battery increase, but the discharge capacity decrease. The solid skeleton and pore phase tortuosity increasing, the discharge platform and the capacity of nonaqueous lithium air battery decrease.