Abstract: This paper is one part of the cross -cultural study on technical creativity of gifted and normal children between China and Germany In this paper, the development of spa- tial representation in Chinese children aged from 11 - 15 -years of age were detected. The results showed that, (1) in general , students ' mental folding ability develop Ed as they grew up: (2) gifted children ' s mental folding ability was significantly higher than normal children. and the strong interaction between age and intelligence indicated that the intelligence of children was the major factor which had impact on their development of mental folding ability: (3) there exited sex difference between boys ' and girls , mental folding ability under the condition mentioned in this paper , the performances of boys were better than that of girls (4) the curve of development of mental folding ability were differ- ent between sub - groups.

Key words: spatial representation, mental folding, gifted and talented children, sex differ- ences