Primarily it introduces the layered elastic system theory and analyzes the analytic solution of stress and displacement when the composite pavement has been explored on the isothermal load.

According to the theories of artificial neural networks and elastic layered system, the author discusses the fitting problem of the maximum tensile stress in the bottom of surface and base for three- layered elastic system by means of the three-layered BP neural network.

Based on “Specifications for design of highway asphalt pavement” (JTJ014-97) and the theory of neural networks, a new method to calculate the deflection of three-layer elastic layered system with a three-layer BP neural network is presented in this paper.

In this paper, elastic layered system theory is employed to analyze the stress between pavement and roadbed interface under axle symmetrical loading; Discussing how stress between pavement and roadbed interface is affected by Parameter of pavement structure (including every layer s thickness.

the paper expoundes the relationship between the resilience modulus of roadbed and pavement each layer and the whole modulus of resilience entirely by using the ways multilayer resilience system theory illustrated, and gives the t.

Coupling with the elastic multilayer foundation,a model of reinforced pavements was proposed.

Secondly, a model of reinforced pavements was proposed by coupling the elastic multilayer foundation and membrane equation according to the continuity of stress and displacement.