It is important in the studies on urban image to discuss not only the perceptible objects itself but also the cognitive schemata figured in pur minds. We can imagine the geographical structure of cities although the objects can not be seen directly. This fact suggests that we have a kind of cognitive schema for the geographical urban image. As an example, we made surveys on our geographical image of the loop lines of stations in Tokyo, Osaka and Seoul. The results show us that our geographical image of loop lines is transfigured to the very simple circular shape with the effects of the cognitive schema.