The purpose of study was to compare the effect of balance performance in the Down syndrome child by the Sensorimotor program. Twenty-four aged 8 to 16 years participated in this study. Participants were divided into experimental(12) and control group(12). Experimental group were received sensorimotor program in three times a week for 6 weeks. But control group were not participants this program. All subjects were assessmented to clinical test such as Oseretsky and Berg balance test. Experimental and control subjects were tested before, after and end(after summer vacation)of the trial. The results were as follow; 1. The physique of Down syndrome child is more dropped than normal child. 2. Balance of Down syndrome child prior to test is clearly dropped. but effect of Sensorimotor program is appeared in experimental group. 3. Balance of experimental group is more decreased than prior to during the summer vacation.