  The analysis of the sum rules (for two differentchoices of 5-quark currents)
indicate that to explain experimental results it is necessary to have some
one-particle lower state (and pentaquark is a reliable candidate to this state)
while the two-particle coupled lower state ($NK$ system) should be excluded.
Obtained sum rules have good stability and correspond to pentaquark mass
$m_\theta$=1.54 $GeV$ at the appropriate choice of continuum threshold. Also
the features of the sum rules for 2-point correlator with 5-quark currents are
studied. This features should be taken into account to obtain sum rules
correctly.
