Abstract: At present, electromagnetic transient analysis plays an increasing significant role in modern power systems. Since the data of power grids are generally given in the form of stability analysis, it is particularly important to construct a platform to convert the data in the form of stability analysis to that in the form of electromagnetic transient analysis. This paper describes the principle of the power flow conversion from BPA to EMTDC, and provides the method to solve inconsistent results by the power flow conversion, based on which the approach of converting generator model in BPA to that in EMTDC has been illustrated, and the corresponding relations of excitation system, PSS, governor and prime mover between BPA and EMTDC have also been given. The effectiveness of the conversion of dynamic models from BPA to EMTDC has been validated by two area four machine system simulation.