  The field-induced polarization reversal in $c$-oriented ferroelectric phase
of strained perovskite film has been studied. We show that in additional to the
conventional longitudinal switching mechanism, when c-oriented polarization
vector changes its modulus, the longitudinal-transversal and transversal
mechanisms when the perpendicular component of polarization is dynamically
admixed are possible. The later process can occurs either via the
straight-abrupt or initially-continues polarization turnover scenario. We
specified the obtained results for the case of PbTiO$_{3}$ and BaTiO$_{3}$
ferroelectrics and propose the experimental methods for their investigation.
