In this paper the difference of radar cross-section between laser′s band and electromagnetic band is described. A flow chart of calculating laser radar cross-section (LRCS) of complex object with visualizing calculation method is presented, the LRCS of a full-size plane object is calculated, and the LRCS of 1∶8 scale-model is obtained by scale relation. Actual measurements were made for obtaining the LRCS of the scale-model by utilizing standard scatter board in the outfield. The results show that the calculation data are agreement with measurements on main scatter direction of object and the scattering characteristic of full size object can be achieved by scale-model measurement.