In tunnel scenes,the interference from vehicle light has a strong impact on the accurate extraction of vehicle targets.However,in the existing methods,there is no solution to this problem.Therefore,a suppression method of vehicle light interference is proposed on the basis of light gradient features,and according to the optical radiation and space structure features,a light intensity model of vehicle light illumination on roads and its vehicle light gradient function are constructed.Furthermore,by utilizing the invariance of gradient directions of vehicle light illumination on roads,the non-vehicle light illumination area is screened and a foreground mask is made.Fi- nally,the foreground mask is overlaid with the moving target foreground,thus suppressing the vehicle light Interfe- rence.Experimental results show that the proposed method can effectively suppress the vehicle light interference,and thus improve the extraction accuracy of vehicle targets.