Abstract
For the purpose of investigating the environment of high-redshift QSOs, we had carried out a statistic study of associated CIV absorption lines. This is the first paper of the study. In the current paper, we present an unbiased homogeneous CIV absorption line sample of 228 QSOs, which includes most of the published QSO spectra data involving CIV absorption lines with high or medium resolution. The CIV absorption systems are selected with 7 criteria. We extracted 229 as our underlying sample from a total of 534 CIV absorption doublets of 228 QSOs. 4 sub-samples are also defined.
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