  The first measurement on the antiproton to proton ratio made by the AMS-02
collaboration agrees with the expection from conventional cosmic-ray
secondaries in the kinetic energy range $\sim 10-100$ GeV, which can be turned
into stringent upper limits on the dark matter (DM) annihilation cross sections
above $\sim 300$ GeV. Using the GALPROP code, we derive the upper limits in
various propagation models and DM profiles. We show that in the "conventional"
propagation model, for the $q\bar q$, $b\bar b$, and $WW$ final states, the
constraints can be more stringent than that derived from the recent Ferm-LAT
gamma-ray data on the dwarf spheroidal satellite galaxies. Making use of the
typical minimal, median and maximal models obtained from a previous global fit,
we show that the variation of the upper limits is around a factor of five. The
possibility of DM contribution to the high energy $\bar p/p$ data is discussed.
