  For a moving atom, the spontaneous emission rate is modified due to the
contributions from two factors, the R\"{o}ntgen interaction term and the recoil
effect induced by the emitted photon. Here we investigate the emission rate of
a uniformly moving atom near a perfectly conducting plate and obtain the
corrections induced by these two factors. We find that the corrections
individually induced by the R\"{o}ntgen term and the recoil effect can be
simply added and result in the total correction to the decay rate. Moreover, it
is shown that the R\"{o}ntgen term gives positive correction, while the recoil
effect induces negative correction. Our work paves the way towards the future
studies of the light-matter interaction for the moving particle in quantum
optics.
