The non-uniformity of vibration amplitude the lateral roughness of pavement. In order to study in the length direction of paver screed has great influence on non-uniformity of lateral vibration of asphalt paver screed, the screed was thought as a flexible body, and a coupled concrete paver was established. The flexible body's rigid and flexible model for compacting mechanism of asphalt dynamic control equations were built using FEA formula and the dynamic equations of coupled rigid and flexible system were deduced. These equations were solved by the Wilson-O method, and numerical simulation was carried out to investigate the distribution of acceleration and amplitude along the length direction of screed, the influence of frequency of tamping and vibrating mechanism on non-uniformity. A paver prototype was tested to verify the theoretic analysis results above. The results showed that： the flexible model of screed accorded with the actual vibration properties of screed; the non-uniformity can be reduced by optimizing the allocation of tamper mass, eccentric shaft mass and eccentricity on every section of screed.