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SGR J1745$-$2900 is a magnetar near the Galactic center. X-ray observationsof this source found a decreasing X-ray luminosity accompanied by an enhancedspindown rate. This negative correlation between X-ray luminosity and spindownrate is hard to understand. The wind braking model of magnetars is employed toexplain this puzzling spindown behavior. During the release of magnetic energyof magnetars, a system of particles may be generated. Some of these particlesremain trapped in the magnetosphere and may contribute to the X-ray luminosity.The rest of the particles can flow out and take away the rotational energy ofthe central neutron star. A smaller polar cap angle will cause the decrease ofX-ray luminosity and enhanced spindown rate of SGR J1745$-$2900. This magnetaris expected to have a maximum spindown rate shortly.

A note on the puzzling spindown behavior of the Galactic center magnetar SGR J1745-2900