The energy deposition process for swift charged psrticles (H+) in allotropic silicon film is discussed in detail with the two component assumption of energy loss.An energy-loss correction factor η(E
p)< 1 has been introduced into the Bethe-Bloch formula and by fitting the experimental data and the η(E
p) value is obtained. As a result
all of the experimental phenomena on the allotropic effect of energy loss can be explained.