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The coupled evolution of pulsar rotation and inclination angle in the windbraking model is calculated. The oblique pulsar tends to align. The pulsaralignment will affect its spin-down behavior. As a pulsar evolves from themagneto-dipole radiation dominated case to the particle wind dominated case,the braking index will first increase and then decrease. In the early time, thebraking index may be larger than 3. And during the following long time, thebraking index will be always smaller than 3. The minimum braking index is aboutone. This can explain the existence of high braking index larger than 3, andlow braking index of pulsars simultaneously. The pulsar braking index isexpected to evolve from larger than three to about one. A general trend is thatthe pulsar braking index will evolve from the Crab-like case to the Vela-likecase.

Possible evolution of the pulsar braking index from larger than three to about one