In this study, an experiment was performed to clarify the flow field, in which the jets or rods were normally injected into a main supersonic flow surrounded by a porous cavity, and this report figures out flow direction and stability in the cavity with thermal tuft probe. In the experiment, a porous cavity is attached to a main duct and rods or jets are inserted to the main duct on the porous cavity. To reveal this flow field, the thermal tuft probe was adopted to experimentally investigate the flow direction in the cavity. In addition to the experiment with the jets, the experiments with rods instead of jet were conducted. In the experiments, the effect of the combination of jets or rods and a porous cavity is studied by means of visualization of schlieren method, pressure distributions and the flow direction in the cavity with the thermal tuft probe. Three cases for arrangements are tested in the experiments. As the results, it is found that the flow direction in the cavity is greatly influenced by the starting shock wave position and the rod or jet. The pressure ratio at which the starting shock wave passes through the porous cavity is affected by the jets and rods. Moreover it is found that the flow in the cavity is influenced by the jet and rod even after the starting shock wave move downstream of the porous cavity.