The spin-down luminosity together with the morphology of pulsar nebula, such a the Crab, have long been known to imply that the pulsar wind be practically unmagnetized immediately before it impinges onto the nebula. In fact, the condition of low wind magnetization can be shown to further imply that the pulsar outer magnetosphere be strongly distorted, where the toroidal field exceeds the conventionally-assumed dipole field by nearly two orders of magnitude in the outer magnetosphere; the current needed requires the plasma density to exceed the Goldreich-Julian charge density by several orders of magnitude. Such a physical condition can certainly impose a constraint on the candidate mechanisms of non-thermal radio emission, and may also place a constraint on the high-energy, electrode-gap emission mechanisms.