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The aim of this study is to present an integrated method to increase the quality of the product during its lifetime through the design of Taguchi experiments and PAF model of quality costs. For this purpose, the combination of the importance of quality costs in the life cycle of the product by combining the PAF quality cost model and designing Taguchi experiments in the Entekhab industrial group in Isfahan has been studied. In this study, four phases of the selected product life cycle (introduction, growth, maturity and decline), at four levels (importance of prevention, evaluation, internal failure and external failure) are considered as control factors. In this study, product quality is considered as a response factor, which is considered to obtain the maximum value. The results of this study on the selected product of Entekhab Industrial Group have been determined. In the introduction stage and growth of product life cycle prevention policy have been selected.  In the maturity and decline stage, the appraisal and domestic failure policy has been chosen as optimal levels. By following these policies, the quality of selected product during its lifetime increases.