Abstract: Sine flutter laser spot was adopted as the pursued target by the guidance system.The influence of target acquisition and designation sight(TADS) frequency laser spot on the guidance precision was analyzed.Through theoretical research combined with simulation results of peak miss distance method and influence factor method gave assessment standards to the precision of TADS.Research results showed that due to laser spot flutter,in some frequency areas the miss distance is greater than the magnitude of the laser spot itself.Simultaneously,the research also showed that the two main reasons causing serious miss distance are the laser spot flutter frequency and guidance system time constant.So in actual design,guidance system time constant should match the TADS frequency bandwidth to avoid large miss distance.