  Intermittent pulsars are part-time radio pulsars. They have higher slow down
rate in the on state (radio-loud) than in the off state (radio-quiet). This
gives the evidence that particle wind may play an important role in pulsar
spindown. The effect of particle acceleration is included in modeling the
rotational energy loss rate of the neutron star. Applying the pulsar wind model
to the three intermittent pulsars (PSR B1931+24, PSR J1841-0500, and PSR
J1832+0029), their magnetic field and inclination angle are calculated
simultaneously. The theoretical braking indices of intermittent pulsars are
also given. In the pulsar wind model, the density of the particle wind can
always be the Goldreich-Julian density. This may ensure that different on
states of intermittent pulsars are stable. The duty cycle of particle wind can
be determined from timing observations. It is consistent with the duty cycle of
the on state. Inclination angle and braking index observations of intermittent
pulsars may help to test different models of particle acceleration. At present,
the inverse Compton scattering induced space charge limited flow with field
saturation model can be ruled out.
