The heat transfer mechanism of a two-dimensional impinging jet with gas-solid suspensions has been investigated through flow measurements using laser-Doppler anemometry. The most striking feature of the flow is the presence of particles rebounding from the impingement plate and of the gas-phase reverse flow caused by those particles. As a result, the turbulent intensity normal to the plate increases markedly near the stagnation point. However, in the wall jet region where the gas-solid interaction is relatively weak, the turbulence structure undergoes only a slight change. Heat transfer experiments in which the loading ratio is varied from 0 to 0.8 have been conducted. Around the stagnation point, the Nusselt number reaches 2.7 times as great as that of the single-phase flow, and the heat transfer enhancement ascribed to the drastic change in the turbulence structure.