Abstract: Structural parameters should be determined fast so as to complete the mechanism design efficaciously. A new method is therefore proposed to design complicated mechanism by a simulation with the parameterization as its core. It means that all the structural dimensions of a mechanism are completely parameterized and users can modify them, if necessary, to implement rapidly modeling/simulation. The connotation of parameterized simulation and its flow in application to complicated mechanism design are discussed in detail. Taking a parallel mechanism as example, the process proposed for parameterized simulation is studied with the software ADAMS used, including the analysis of mechanism, parameterized modeling, creating dialog and starting the menu and parameterized simulation. The results verify the efficacy of method.