In this paper, we introduce MTS(Mahalanobis-Taguchi System) Method which is suggested Dr. Taguchi in later 1990. We apply MTS Method for Quality Competitive Appraisal System(QCAS) Model which is executived from 1997 by Agency for Technology and Standards, Ministry of Commerce, Industry and Energy(MOCIE). We can measure company Quality competitive by using MTS. MTS Measure can not be compared statistical sum by calculated QCAS. MTS can be possible distinct subtle which can not distinct using statistical sum. Also MTS Method can seek more strong effect factor among of many factor. If A Company use MTS Method, can find vital factor and level of destination.