Radar image scene matching is an important means on navigation and location of aeroplane

due to its all-weather imaging capability. However

because of radar side looking and terrain undulation

the real objects distorts and displaces when radar scene is imaged. It impacts the matching precision between a radar image and the reference one. In this paper

based on the way of scene imaging

the analogy real-radar image （image one） is made from reference image firstly. And the impact of terrain undulation is introduced into the real-radar image one by rectification with DEM data. Then the real-radar image （image two） is produced

which contains the impact of terrain undulation. In the experiment

two types of the analogy real-radar images of the same area are matched with the reference one. The matching results are compared

and the difference of matching result is used to analyze the practical influence of terrain undulation on radar scene matching. At last

the article draw a conclusion——the imaging characteristic of actual surface object is a main factor that affects matching

and the terrain undulations just have influenle on matching only when it combined with object feature.