类星体是20世纪60年代天文学的四大发现之一，是典型的活动星系核。在类星体发现不久后，人们就在类星体的光谱中探测到了吸收线。在类星体发现之后的半个世纪，尤其是大型光谱巡天望远镜的出现，大量的类星体吸收线已经被探测到。类星体吸收线对研究类星体本身的特征以及其附近和周围的环境，对研究星系的特征以及演化，对研究宇宙学等是非常重要的。本项目将在SDSS-III的BOSS的类星体光谱中证认Mg II双吸收线和C IV 双吸收线。在SDSS中低分辨率的光谱中，Mg II 双吸收线和C IV 双吸收线经常会被误证，鉴于此原因，对于C IV发射线蓝端的光谱区域，本项目将同时证认Mg II双吸收线和C IV双吸收线，并将尽可能地找到这些光谱区域中的Mg II双吸收线系统和C IV双吸收线系统的其它元素的吸收线，从而尽可能地排除误证。相信通过本项目的实施，我们可以为天文同行提供更可靠的、更大样本的吸收线系统。

Quasars are the typical active galactic nuclei. Quasar absorption lines have been detected shortly after the discovery of quasars. After five decades of the discovery of quasars, espectially the advent of large spectroscopic surveys, i. e. the Sloan Digital Sky Survey, tens of thousands of absorption lines have been detected on the quasar spectra. Quarsar absorption lines can provide a wealth of information on the physical conditions and dynamical prosses within quasar hosts and the gaseous Universe. In this project, we are going to identify the Mg II absorption doulets and the C IV absorption doublets on the quasar spectra of the Baryon Oscillation Spectroscopic Survey (BOSS) of the Sloan Digital Sky Survey III. Owning to the spectral resolution of the SDSS, the Mg II absorption doublets and the C IV absorption doublets are often misidentified each other in the spectral regions shortward of C IV emission lines. Thus, in this project, we will simultaneously identify the Mg II absorption doublets and the C IV absorption doublets in the spectral regions shortward of C IV emission lines, and, as far as possible, identify other species for these absorption systems. Based this project, we believe that we can provide a reliable and sizeable sample of absorption systems.