The study employed the Test of Science Process Skills (TSPS) to determine the science process skills of fourth and sixth grade students in Hsinchu County, Taiwan. the results showed that the fourth and sixth grade students’ TSPS scores exhibited significant correlations in students’ grade and parents’ occupation, the schoolgirls were great than the schoolboys in the performance of TSPS scores, then students of different type electuary school weren’t the same in performance of TSPS scores. In general, the elementary students’ characteristics affected the performance of TSPS scores.