  We investigate the structure of the dark matter halo formed in the cold dark
matter scenarios by N-body simulations with parallel treecode on GRAPE cluster
systems. We simulated 8 halos with the mass of $4.4\times 10^{14}M_{\odot}$ to
$1.6\times 10^{15}M_{\odot}$ in the SCDM and LCDM model using up to 30 million
particles. With the resolution of our simulations, the density profile is
reliable down to 0.2 percent of the virial radius. Our results show that the
slope of inner cusp within 1 percent virial radius is shallower than -1.5, and
the radius where the shallowing starts exhibits run-to-run variation, which
means the innermost profile is not universal.
