Commission International de Illumination (CIE) publishes‘CIE 127 technical report’(CIE 127) for light emitting diode(LED) measurement.Two different conditions (condition A and condition B) for measurement of averaged LED Intensityare proposed in CIE 127,and the LED measurement method gradually win the worldwide recognition.Most of the LED has a different averaged LED intensity in these two measurement conditions,and the difference is up to 10% in some LED measurements,so it is difficult to evaluate the averaged LED intensity accurately.Mathematical models for different kinds of luminous intensity distribution have been created according to a large amount of measurement data.Simulation results and measurement results make clear that the impact of strong directional luminous intensity distribution can be reduced to less than 0.5% when distance between detector and LED is up to 645 mm,and the equivalent full plane angle is approximately 0.5°,this work makes the value of averaged LED intensity have consistency widely.