Modern observational data confirm the hypothesis that short-period pul
sars (P less than or similar to 0.1 s) are a special group of objects,
with their own emission mechanism and location of the emission region
near the light cylinder. The conventional assumptions of nonrelativis
tic rotation (alpha much less than 1) and low plasma energy compared t
o the magnetic field energy in the magnetospheres of these pulsars (sp
ecified by the parameter xi) are incorrect. It is therefore necessary
to develop a magnetosphere model for pulsars with P less than or simil
ar to 0.1 s for alpha and xi values of the order of unity. Plasma inst
abilities that could be sources of the observed emission from short-pe
riod pulsars are indicated.