The rule of dispersion-managed soliton transmission in birefringent fiber is analyzed by variational method. Firstly,The model of perturbed soliton transmission in birefringent fiber is built, and then the rule of transmission evolvement of the DMS parameters influenced by PMD is analyzed, at the last, the analysis results are numerical computed. The results indicate that the parameter of PMD has a great impact on the energy and width of DMS evolution. While the PMD is big like as the Dp>0.3 ps/km1/2, the some of online control methods must be used to restrain the PMD effects on this transmission system, but if Dp≤0.1 ps/km1/2, the transmission system can hardly be effected by PMD. The results also prove that the DMS possess a characteristic of robustness to PMD. These results provide the theoretical evidence and research way for studying influence of PMD in systems of high-speed nonlinear pulse transmission, particularly in DMS system transmission.