According to the question of Radar ranging for the moving target, using the echo characteristic of wideband linear frequency modulated pulse, a method of range measuring for moving target based on Radon-Wigner transform is proposed. In this method, firstly, a mathematic model of stretch processing for moving target scatter echo is studied. Secondly, according to the superposition of echo and the characteristic of LFM after stretch processing, the parameter of frequency modulation is estimated with the excellent time-frequency concentration performance of Radon-Wigner transform. Finally, the range of moving target is measured. The results show that this method is effective for range measuring of moving target.