The axial and tangential velocities of gas and particle phases and particle concentration for turbulent swirling and recirculating gas particle (simulating gas droplet) flows in a cold model of a dual inlet sudden expansion combustor with partially tangential central tubes, proposed by the present authors, were measured by using a 2 D LDV system and a laser optic fiber system combined with a sampling probe. The results show that there are both gas and particle strongly reverse flows and swirling flows in the head part of the combustor. The velocity slip between gas and particle phases is remarkable. The particle concentration is higher near the wall and lower near the axis. There are two peaks in the concentration profiles near the inlet tubes. The above obtained flow characteristics are favorable to ignition, flame stabilization and combustion. The results can also be used to validate the numerical modeling. The axial and tangential velocities of gas and particle phases and particle concentrations for turbulent swirling and recirculating gas particles (simulating gas droplet) flows in a cold model of a dual inlet sudden expansion combustor with partially tangential central tubes, proposed by the present authors, were measured by using a 2 D LDV system and a laser optic fiber system combined with a sampling probe. The results show that there are both gas and particle strongly reverse flows and swirling flows in the head part of the combustor. The velocity slip between gas and There are two peaks in the concentration profiles near the inlet tubes. The particle obtained is favorable to ignition, flame stabilization and combustion. also be used to validate the numerical modeling.