The article expatiates on the composition of hardware and working princ iple of pressure sensors , assessment indexes of postural sway and its calculati on methods, the development of the special software of the BSR-1 Body Balance T esting Instrument.

Using the methods of physical strength measurement, questionnaire and mathematical statistics, and from the aspects of single-foot support ability and shaking volume of center of gravity, the study inquired into the effect of Taijiquan exercise on middle and old-aged persons static balance ability.