Focused on the problem of low efficient of traditional modeling method, the Modelica was briefly introduced and compared with Simulink, the typical modeling modes of Modelica were expounded. Conversion from mathematic model to simulation model was realized, and switch proposition of multi-phase flight of ballistic missile during modeling was solved, and parameters of model are managed effectively. The construction of missile system model was realized by dragging model icons under graphics modeling environment. The hierarchy of model was clear and the simulation results were verified. Some fine characteristics of Modelica were displayed in this contribution and it is of certain reference value for developing homogenous model using Modelica.