An n×n sign pattern A is a spectrally arbitrary pattern if for any given real monic polynomial f(x) of degree n

there is a real matrix B∈Q(A) and B has characteristic polynomial f(x).If A is a spectrally arbitrary pattern and no proper subpattern of A is spectrally arbitrary

then A is a minimally spectrally arbitrary pattern.A new sign pattern K with 2n nonzero entries is given.It is proved that n×n(n≥6) sign pattern K is a minimal spectrally arbitrary pattern by using the Nilpotent-Jacobian method.