  The structure of Omega-pi state with isospin I=1 and spin-parity J^p=3/2^-
are dynamically studied in both the chiral SU(3) quark model and the extended
chiral SU(3) quark model by solving a resonating group method (RGM) equation.
The model parameters are taken from our previous work, which gave a
satisfactory description of the energies of the baryon ground states, the
binding energy of the deuteron, the nucleon-nucleon (NN) scattering phase
shifts, and the hyperon-nucleon (YN) cross sections. The calculated results
show that the Omega-pi state has an attractive interaction, and in the extended
chiral SU(3) quark model such an attraction can make for an Omega-pi
quasi-bound state with the binding energy of about several MeV.
