  Assuming the wind-fed accretion magnetars in long period X-ray pulsars, we
calculated the rotational evolution of the neutron stars. Our calculations
considered the effects of the magnetic field decay in magnetars. The results
show that wind-fed accretion magnetars can evolve to the long period X-ray
pulsars with a spin period much longer than 1000 s. The spin-down trend
observed in 4U 2206+54 like sources is expected when the young X-ray binary
systems are on the way to their equilibrium period. Detailed calculations
showed that its spin-down may be affected by accretion with outflows or
accretion while spin-down. Due to the magnetic field decay in magnetars,
wind-fed accretion magnetars will have a decreasing equilibrium period for a
constant mass accretion rate. For 2S 0114+65, the spin-up rate due to magnetic
field decay is one order of magnitude smaller than the observations. The
spin-up rate of 2S 0114+65 may be attributed to the formation of a transient
disk during wind accretion. The slowest X-ray pulsar AX J1910.7+0917 would be a
link source between 4U 2206+54 and 2S 0114+65.
