The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST), as one of the National Major Scientific Projects, represents another landmark in the development history of Chinese optical telescope. The overall concept and key technical innovations make it a unique astronomical instrument combining a large aperture with a wide field of view. The available large focal surface is in the international leading level, promising a very high spectrum acquiring rate of several ten-thousands of spectra per night. The First Data Release of the Sky Survey (DR1), including spectra of the pilot survey and spectra of the first year of the regular spectroscopic survey, have already published to domestic data users and foreign partners. The DR1 totally contains 2,204,696 spectra, including stars, galaxies, quasars and unknown types. According to the latest news, LAMOST has released the DR2, which can be accessed in the official website. The expanding pool of spectra provide the opportunity to search for peculiar galaxies and analyse their physical properties. All works in this paper focus on LAMOST spectra dataset, and the main contributions of this thesis include the following four aspects: 1. Considering the difficulty in sky subtraction of LAMOST spectra, a new method to precisely subtract sky background in local region is proposed. It solved the problem that broad emission lines in quasar often contaminated by the poor accuracy of sky subtraction. This method build the precise sky background model based on the profile parameters of super sky and the flux of object at the beginning of the spectra processing by LAMOST. Experimental results show that, at Hb - [OIII] intervals, the spectral quality of quasars in different redshift has been significantly improved by our method, relative to the LAMOST data reduction system. It provides a complementary solution for a small part of LAMOST spectra which are not well subtracted by LAMOST. This method will lay the foundations for the search and analysis of peculiar galaxies in LAMOST spectra dataset. 2. Considering the characteristic of LAMOST spectra, a new approach to systemic search for galaxies and active galactic nuclei (AGN) with double-peaked narrow emission lines has been developed. Firstly, we use signal-to-noise, equivalent width and redshift of spectra with a looser criteria for trimming the DR1 sample. Secondly, spectral lines of galaxies and AGN are extracted by stellar population synthesis. Thirdly,...
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