On the basis of the analysis of the existing grey incidence degree and grey T ' s incidence degree, an improved model of grey T ' s incidence degree is putted forword. The improved one can reflect the positive and negative relation of sequence, possesses symmetry property, unique property, comparable property and preserving-order property after non-dimensionalization, and satisfies extending standard property. Last an example is given to illustrate that the improved one can more really reflect the incidence degree of sequence and the result of grey incidence analysis by this method is more scientific than before and is easy to calculate on the computer.