Thaks Adam, but I use compass function not polarplot.
Anyway, I found my solution in:
using the following code:
Z = compass(eig(randn(5)));
colors = get(0,'DefaultAxesColorOrder')
for i=1:length(Z)
set(Z(i),'color',colors(mod(i-1,length(colors))+1,:),'linewidth',2)
end
Thanks