The　choice　of　maintenance　strategy　has　great　influence　on　structure　state　and　maintenance　expense.　According　to　the　state　of　aeismatic　structure,　by　introduction　of　finite　period　Markov　decision　theory,　maintenance　strategy　optimization　of　aeismatic　structure　during　design　reference　is　discussed.　A　mathematical　model　of　stochastic　dynamical　programming　which　maximum　expected　reward　during　design　reference　period　is　present.　By　solution　of　Markov　decision　inverted　sequence,　the　optimum　maintenance　strategy　of　each　stage　and　total　maximum　expected　reward　can　be　obtain　during　design　reference　period.　An　optimization　maintenance　strategy　of　expected　reward　maximization　is　given　during　design　reference　period.　All　of　these　provide　a　scientific　method　for　maintenance　decision-making.