Abstract:Oxygen Bomb/Air Bomb Aging Test Oven is the based test equipment of rubber plastic wire and cable. It’s main technical indicators include Space temperature deviation, temperature fluctuation and Temperature deviation. The calibration of Oxygen Bomb/Air Bomb Aging Test Oven is according to the JB/T4278.9-2011. Because there are some differences between JB/T4278.9-2011 and JJF1101-2003, so the evaluation of measurement uncertainty is diffident. This paper evaluates the measurement uncertainty about the temperature of Oxygen Bomb/Air Bomb Aging Test Oven, this method is also useful to the other kinds of test equipment on rubber plastic wire and cable.