Based on the Linear Elastic Multi-layer Theory, using the pavement finite-element program, this article discussed the shear stress distribution regularities and influencing factors in high grade asphalt pavement layers. The results demonstrate that the max shear stress appears in surface to 3cm depth span regardless of the material characteristic and thickness in each layer. The major influencing factors on the shear stress are modulus and Poisson ratio of asphalt layer, modulus of base layer. By comparing the database with testing results, to three asphalt layers pavement structure, it is necessary to check the shear strength in wearing layer and midlayer. When checking, the precious position must be found to calculate the max shear stress in each layer.