The impact of satellite reconnaissance information precision on hitting probability of missile hitting maritime floating target was investigated，which is significant for improving the operational efficiency of missile. According to the principle of missile hitting maritime floating target, the operational process was depicted, the impact factors of hitting probability were analyzed, and the calculating model of hitting probability based on satellite reconnaissance information precision was established. The impact of satellite reconnaissance information precision on hitting probability was analyzed by Monte-Carlo method. The results prove that if the satellite reconnaissance information precision is in the acceptable range，the impact is able to be ignored；otherwise，the missile hitting probability descends along with the fall of the information precision.