Abstract: The optimum parameters of a TMD system can be determined with optimization designing. However, sometimes object functions needed to be optimized are more than one. Although itcs possible to integrate multiobject functions into one object function with weighting method, how to select weighting coefficients is disputable. Besides, there are always errors between the parameters realized in practical engineering and the designed ones which would deteriorate optimization effect.It. s difficult to find out how bad things were from optimum parameters. The concept of effective parametric fields is presented. To design TMD system with effective parametric fields can effectively improve reliability of the TMD system,therefore promote the spread and utilization of TMD shock-absorption technique.