Aimed at the parameter extraction of Linear Frequency Modulation (LFM) signal, an novel parameter extraction method is proposed in this paper based on Erosion transform and Hough transform. First, LFM signal is described by using B-distribution analysis method. On the basis of this, the Erosion transform is utilized to highlight the characters of radar LFM signal, and then Hough transform is employed to extract LFM signal parameters. The simulation indicates that the method can not only extract the parameters of LFM signal in precision,but alsohas a good anti-noise performance.