This paper describes exciting force models about walking up/down stairs for landing toe first. First part describes a experiment system for measuring live load of one step when walking up/down stairs by using a force plate and a model stairs which are capable of being adjusted the rise and tread part. Second part describes characteristics of waveform shape and maximum value of one step waveform. Final part proposes dynamic load coefficients α1 ～α6 for walking up/down stairs and describes these coefficients are similar to those of walking motion.
