In this paper, the influence of the rainfall on the satellite communication link is statistically evaluated from the data of the received signal level and bit error (BE) obtained from the satellite communication experiment, and the bit error generation method are shown for the development of bit error generation method on satellite link. First the influence of the rainfall on the downlink is extracted, and the feature of BE under this condition is shown. Next, the coefficient of variation is introduced into a bit error generation method proposed by us, and the result is shown.