The purpose of this study were to compare the balance performance with 44 children, who aged 6 and 7years old by means of the Pediatric Clinical Test of Sensory Interaction for Balance(PCTSIB), second is to determine whether age and gender-relatad difference were present, third is to found correlation of weight, height with duration of balance performance. All subjects were performed with different foot position that were feet-together, heel-toes. The starting position was that subject placed their hands on the hips. The results of each test were measured by stop watch. These collected data were analyzed by using oneway ANOVA, Sheffe test t-test and correlation. The results of this study were as follows ; 1. There were all significiant difference is all instances except condition 4 with heel-toes(p<0.05). The duration of balance performance of 7-year-olds group was more increased than 6-year-olds group. 2. There was statistically significiant difference in all instances by gender(p<0.05). 3. There was no correlation between weight or height duration of balance performance (p<0.05).