Vehicle Dynamics Simulation is widely applied to many stages of vehicle development, accuracy of the simulation is strictly required. Since accurate vehicle dynamics simulation requires correct vehicle parameter value, but they are hardly be obtained in many cases, during the stages of the vehicle development system suppliers are usually in such circumstances due to measurement facilities / confidentiality. However, running vehicle behavior can be measured and logged as chronological data. Since “Data to be compared” are not simple index but chronological curve, decision criteria (good or bad etc.) they tend to be subjective, thus hard to be consistent. The procedure to predict reasonable value of each parameter could be defined only by well experienced engineer in Vehicle Dynamics Simulation field, skillful engineer has to repeat “Trial and Error”,this work to be done isn’t creative, thus it is really wasting time and money.