Some necessary and sufficient conditions for uniform polynomial stability and uniform polyno-mial instability were given, respectively. Generalizations of some well-known results were obtained due to Datko, Stoica, Megan in the case of polynomial asymptotic of skew-evolution semiflows in Banach spaces.%给出了斜演化半流一致多项式稳定和一致多项式不稳定的一些充要条件，用所得结论推广了已有结果。
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