Modeling and simulation of multi-body system dynamics is a difficulty in mechatronics integrated designing environment.Traditionally through multi-body domain-specific software packet

the DAEs is generated

which is then converted to the uniform modeling language and embedded in the integrated environment.Based on port-based modeling paradigm

this paper constructs the Multi-Ports Component model for multi-body system dynamics

and detailed component behavior model is given adopting VHDL-AMS uniform modeling language.At the end

an example is used to demonstrate the main ideas.