The measure of track correlation uncertainty was defined and was compared with the Shannon entropy measure and Hartley measure of information uncertainty.Then,the usage of track correlation uncertainty was expressed.Lastly,the requirements and a mathematic model for evaluating the track correlation uncertainty were proposed.Simulation results show that the track correlation uncertainty is measurable and can be correctly evaluated.The proposed evaluation method can quantitatively describe the effects of target separations,sensor measurement errors,correctness of track correlation,etc.to the track correlation uncertainty very well.Moreover,to the same input of correlation results,the proposed evaluating method can output almost the same evaluating results of track correlation uncertainty for the same correlated track pairs,no matter the sensors have systematic errors or not.