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The accuracy of foreground detection is an important factor to the intersection of vehicle detection. There’s ghost phenomenon in traditional foreground detection method based on background modeling, and it’s difficult to distinguish unlicensed vehicles. Aiming at the above problems, put forward a foreground detection method based on ViBe and frame difference, and combining with license plate detection result to detect vehicles in scene. Firstly, using different factor to update background model depend on the result of frame difference method and the ViBe algorithm. Secondly, a multi condition filter is applied to detect license plate in foreground. Finally, take the center of license plate as the anchor to locate vehicle area. The experimental results show that multi vehicle detection based on ViBe and frame difference method can effectively deal with the ghost phenomenon in intersection scene, at the same time the vehicle detection algorithm can accurately detect vehicles enters the scene, and identify unlicensed vehicles.