We present the results of Spectral Energy Distribution (SED) fitting analysis for Lyman Break Galaxies (LBGs) at $zsim5$ in the GOODS-N and its flanking fields. From the SED fitting for $sim100$ objects, we found that the stellar masses range from $10^{8}$ to $10^{11}M_{odot}$ with a median value of $4times10^{9}M_{odot}$. By using the large sample of galaxies at $zsim5$, we construct the stellar mass function (SMF) with incompleteness corrections. By integrating down to $10^{8}M_{odot}$, the cosmic stellar mass density at $zsim5$ is calculated to be $7times10^{6}M_{odot}textrm{Mpc}^{-3}$.
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