A new evaluation method, Correction-Rate, was proposed, which can quantitively compute the effect of NUC, and some experiments were performed to verify its advantages. Correction-Rate uses the temporal noise as a reference standard to evaluate NU of the infrared images. It can not only reflect the display effect, but also the temperature-measuring precision. This measurement can be used in comparison of the performances of IRFPA system and evaluation of the effects of NUC methods. It is very meaningful for the further research of NUC.