  Based on recent measurements on the charge-to-mass ratios of proton and
anti-proton, we study constraints on the parameters of noncommutative phase
space. We find that while the limit on the parameter of coordinate
noncommutativity is weak, it is very strong on the parameter of momentum
noncommutativity, $\sqrt{\xi} \lesssim {\rm 1\mu eV}$. Therefore, the
charge-to-mass ratio experiment has a strong sensitivity on the momentum
noncommutativity, and enhancement of future experimental achievement can
further pin down the momentum noncommutativity.
