Abstract: Cu/Cu2O oxygen sensor was tested on the pool type experimental device for solid-phase oxygen control. Experimental device was cooled from 500℃ step-by-step to 300℃. 95%Ar+5%O2 was injected during cooling process. The test indicates that the Cu/Cu2O oxygen sensor shows good performance in terms of accuracy and responsiveness in the temperature range from 300℃ to 500℃. Oxygen sensors can respond to the changes of oxygen concentration caused by temperature change quickly. The relative deviation between the electromotive force (EMF) of the oxygen sensor and the theoretical EMF remains within ±3%, and the oxygen concentration relative deviation is maintained within ±10%. Oxygen sensor signal fluctuation in the test is within 1.7 mV.