Based on the theory of grey incidence analysis and vector projection, a new grey projection incidence degree is developed. Then, some properties such as normality, similarity, parallelism are studied. This model is able to fully employ the information of every point of the whole sequence, and avoid predicting trend using discrete points. Finally, an example is used to illustrate the effectiveness of the model, which suggests that the grey projection incidence model can reflect the correlation degree among relevant factor sequences.