  Color-octet contributions to the associate J/psi+gamma hadroproduction are
studied in detail, and found to be negligible, compared to the ordinary
color-singlet contribution. Within the color-singlet model the J/psi+gamma
production in the leading order is possible only through gluon-gluon fusion
process. Therefore, the associate J/psi+gamma hadroproduction remains to be
useful as a clean channel to probe the gluon distribution inside proton, to
study heavy quarkonia production mechanism, and to find proton's spin
structure.
