  The work proposes a new method for measuring the gluon jet fraction in jet
sample produced at the hadron collider. This method uses model quark/gluon
templates - distributions of quark and gluon jets over the jet macro parameter.
Within the framework of this method, it is possible to find a model uncertainty
of measurement associated with the deviation of model quark/gluon templates
from the true ones. The issue of data-motivated corrections to the model
quark/gluon templates is discussed.
