Abstract: In this experiment on the development of spatial representation, chil- dren's mental rotation and their use of reference information in real sp- ace were observed under the following conditions: 1) object-location in free movement of Ss, 2) person - and object-locations in photos and 3) locations in sketches. Ss were aged 4, 5 and 6. The results showed that the task of sketch was more difficult than that with free movement, and the photo task was the most difficult; the factor of rotation functioned diff- erently under different conditions; and children's egocentric responses were related not only with age but also with landmarks in real space.

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