  In this review paper we explain the following gamma-ray emission features
from the millisecond pulsars. (1)Why is the dipolar field of millisecond
pulsars so weak but the magnetic pair creation process may still be able to
control the size of the outergap? (2)A sub-GeV pulse component could occur in
the vicinity of the radio pulse of millisecond pulsars. (3)Orbital modulated
gamma-rays should exist in the black widow systems for large viewing angle.
