  In the search of QCD phase boundary and critical point, higher-order
cumulants of conserved quantities are proposed as promising observables and
have been studied extensively both experimentally and theoretically. In this
paper we present cumulant ratios up to $6^{th}$-order of net-proton number
distributions in Au+Au collisions at $\sqrt{\mathrm{s_{NN}}}$ = 7.7 - 200 GeV
from STAR Beam Energy Scan program phase I and $\sqrt{\mathrm{s}}$ = 200 GeV
$p+p$ collisions. The results are compared with various models and Lattice QCD
calculations.
