The edge stress reduction is one of the crucial factors in the airfield concrete pavement thickness design. At present, in calculating the thickness of cement pavement, the load transfer effect of joints is of consideration by both China and the United States according to 25 per cent of reduction factor in stress, but this is quite different from the actual situation. Based on the field measurement, the variation characteristics of stress reduction under the influence of structure parameters and joint types are analyzed statistically. Besides, in consideration of the airfield concrete pavement structure characteristics in China, the finite element method is adopted to analyze the rules of stress reduction under the influence of pavement structural parameters and joint stiffness. The result shows that the stress reduction factor is closely related to pavement structures and joint types. Furthermore, compared with the base thickness and modulus, the reduction factor of edge stress is more sensitive to the changes of the slab thickness and the foundation reaction modulus, and increases with increment of the slab thickness and decreases with increment of the foundation reaction modulus. Moreover, with the increment of joint stiffness, the reduction factor presents an “S” growth trend and can be described by quadratic function. With the increment of the load transfer coefficient, the trend is approximately quadratic function. Finally, this paper gives the values of the stress reduction factor under different load transfer ability.