Abstract
We examine in some detail the influence of the systematics indifferent data sets including type Ia supernova sample, baryonacoustic oscillation data and the cosmic microwave backgroundinformation on the fitting results of the Chevallier-Polarski-Linderparametrization. We find that the systematics in the data sets doesinfluence the fitting results and leads to different evolutionalbehavior of dark energy. To check the versatility ofChevallier-Polarski-Linder parametrization, we also perform theanalysis on the Wetterich parametrization of dark energy. Theresults show that both the parametrization of dark energy and thesystematics in data sets influence the evolutional behavior of darkenergy.
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