  Using data from the ATNF pulsar catalogue, 186 binary pulsars are shown in
the magnetic field versus spin period (B-P) diagram, and their relationship to
the spin-up line is investigated. Generally speaking, pulsars in binary systems
should be below the spin-up line when they get enough accretion mass from their
companions. It is found that there are seven binary pulsars above the spin-up
line. Based on the parameters of these seven binary systems, we describe
possible reasons why they are above the spin-up line.
