Abstract: This paper is focused on the experiment of light back scattering characteristics for existing roughness blocks and other typical rough targets. The experimental results show that, when the wavelength of incident light is 632.8 nm, an obvious change of scattering intensity for different targets can be observed as incident angle gradually increases. If the root mean square of surface slope for different targets keeps close, as a whole, the scattering intensity will show almost same tendency when it varies and there will be no obstacle difference between the polarization degrees for different targets. Particularly, the target with relative small root mean square of surface slope will show obviously larger scattering intensity as well as polarization degree than other targets. This means that the intensity of back scattering light for the target which has relative smooth surface is much stronger than those which show relative rough surface. The research results in terms of back scattering characteristics for typical rough targets in this paper are useful for further theoretical and experimental studies on the target recognition.