The method based on the ridgelet transform is proposed to detect the linear feature.The method is used to pick up the linear splits from the complex environment on the freeway surface,which is against the limitation of the wavelet.The ridgelet transform algorithm is implemented by combining the Radon and wavelet transform.The basic condition to reconstruct the original image is proposed.We applied the method to detect the actual surface data and initialize the default threshold(27.939 5) to reduce the noise and obtained the better results than traditional wavelet at the respects of linear split picking-up and point-noise restraining.The effect shows that the resolution factor is within 2 mm.