  The nature of ultraluminous X-ray sources (ULXs) is not yet fully understood
but it can be done in the most efficient way by analyzing its optical emission
and environment. We present preliminary results of photometric and spectral
studies of some newly identified ULX optical counterparts. Based on the X-ray
catalog of ULX candidates by Liu 2011 we have unequivocally identified in the
optical range more than 100 sources, for 49 of them we carried out a long slit
spectroscopy. According to these results, the majority of the most brightest
candidates (m$_V < 22^m$) turned out to be background objects of different
types, but the observed parameters of other sources of the sample allow us to
classify them as real ULX. Here we present results for ten selected sources.

High Energy Astrophysical Phenomena