Abstract: In order to solve space scene similarity measure problem when the space scene contains differententity numbers, this article uses feature matrix to describe space scene, then it also uses the feature matrix of query scene and database scene to generate scene associated graph and uses the various matching circles of the associated graph to get space scene collection. After that, based on space scene completeness and similarity measure model for each scene of the scene collection, the matching degree will be calculated. Finally, we can get the best match scene and the matching results will be analyzed and evaluated.Experimental results show that this method can better measure the similarity space scene which contains differententity numbers.