  We have examined the metal enrichment of the intergalactic medium (IGM) based
on a galactic wind model. A galactic wind driven by supernovae brings metallic
gas to the IGM but not so far beyond the gravitational potential. The expanding
velocity of the outflow depends on the star formation timescale. Examining 3D
calculation for the IGM in CDM model, we find that only 10 % region has
metallicity larger than $10^{-2}Z_{\odot}$ at $z=3$. Wide range of the IGM
metallicity produces variety of CIV column densities for a fixed HI column
density.
