sky coverage provide us much larger sample of galaxies for doing detailed and statistic studies on many fields. Moreover, the multiwavelength data of a large set of astronomical objects from far-ultraviolet (FUV) to NIR have been carried by high efficient surveys and have been released for public use, such as Galaxy Evolution Explorer (GALEX) in FUV and near-ultraviolet (NUV), Sloan Digital Sky Survey (SDSS) in optical and Two Micron All Sky Survey (2MASS) in NIR. These multiwavelength data will help us to well study the properties of a large sample of LSBGs. We focus on the ages of LSBGs in this work.

We will study the ages of a large sample of nearly face-on disc LSBGs selected from SDSS Data Release 7 (DR7, Abazajian et al. 2009) main galaxy sample (MGS, Strauss et al. 2002), and then matched them with the 2MASS /NIR and GALEX/UV data, so that their SEDs could cover from FUV to Ks (1350Å  to 2.17$\mu$m) bands. The selected sample of LSBGs are 1,802 with their $\mu_{0}$(B) $\geq$ 22 mag arcsec$^{-2}$. Indeed, this is a follow-up work of Zhong et al. (2008) and Liang et al. (2010). In Zhong et al. (2008), we selected a la SDSS 