Lane identifying is one of the key steps of the navigation technology in intelligent vehicle.Lane edge was simulated with parabola model,so the descriptions of the linear lane and the bent lane are unified.The lane edge was identified by an ant colony algorithm in which the search is converged in the better path as soon as possible by the positive feed back of hormone and the parabola parameters are determined.The simulated results show that the veracity and the real-time meet the actual need.