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Formation damage evaluation is an important component in well test analysis and for- mation evaluation. Formation damage of one-layer reservoir has been studied by decomposing the total skin factor and estimating the mud pollution depth. And the well test analyses for multilayered reservoirs were reported, but relation between the total skin factor and individual layer skin factor has not been considered. The relation is devel-oped in this note with well test analysis combining numerical simulation, which aids properly evaluating formation and making stimulating decision.