  Here we report the results of searching millisecond pulsar (MSP) candidates
from the Fermi LAT second source catalog (2FGL). Seven unassociated
$\gamma-$ray sources in this catalog are identified as promising MSP candidates
based on their $\gamma$-ray properties. Through the X-ray analysis, we have
detected possible X-ray counterparts, localized to an arcsecond accuracy. We
have systematically estimated their X-ray fluxes and compared with the
corresponding $\gamma$-ray fluxes. The X-ray to $\gamma$-ray flux ratios for
2FGL J1653.6-0159 and 2FGL J1946.4-5402 are comparable with the typical value
for pulsars. For 2FGL J1625.2-0020, 2FGL J1653.6-0159 and 2FGL J1946.4-5402,
their candidate X-ray counterparts are bright enough for performing a detailed
spectral and temporal analysis to discriminate their thermal/non thermal nature
and search for the periodic signal. We have also searched for possible
optical/IR counterparts at the X-ray positions. For the optical/IR source
coincident with the brightest X-ray object that associated with 2FGL
J1120.0-2204, its spectral energy distribution is comparable with a late-type
star. Evidence for the variability has also been found by examining its optical
light curve. All the aforementioned 2FGL sources resemble a pulsar in one or
more aspects, which make them as the promising targets for follow-up
investigations.
