  The quantum molecular dynamics model has been improved to investigate the
reaction dynamics induced by antiprotons. The reaction channels of elastic
scattering, annihilation, charge exchange and inelastic collisions have been
included in the model. Dynamics on particle production, in particular pions,
kaons, antikaons and hyperons, is investigated in collisions of $\overline{p}$
on $^{12}$C, $^{20}$Ne, $^{40}$Ca, $^{112}$Sn, $^{181}$Ta, $^{197}$Au and
$^{238}$U from a low to high incident momentum. The rapidity and momentum
distributions of $\pi^{+}$ and protons from the LEAR measurements can be well
reproduced. The impacts of system size and incident momentum on particle
emissions are investigated from the inclusive spectra, transverse momentum and
rapidity distributions. It is found that the annihilations of $\overline{p}$ on
nucleons are of importance on the particle production. Hyperons are mainly
produced via meson induced reactions on nucleons and strangeness exchange
collisions when the incident momentum is below the threshold value of
annihilation reaction. A higher nuclear temperature is obtained from the kaon
emission, but it has a lower value for hyperon production.
