Abstract: In the present study, 117 4-and 5-grade students were tested with spatial test and geometrical test,correlation between the students' performances on these two tests was analysed. The results showed: 1) in general, as well as on the geometrical test,the performances of the 5-grade students on the spatial test were significantly higher than that of the 4-grade students', but not in all aspects of the spatial test; 2) either in total number of subjects or in 4-and 5-grade separately, the correlations between the performances of the two tests were sig- nificant; 3) the performances of students in the research on the geometrical test can be predicted to a certain degree through the regression equation: Y ? = 0.5736X_i+0.7635.

Key words: spatial representation, spatial ability, geometrical ability, regression equation