The water temperature and the salinity at the botton layer of the eastern Bering Sea were analyzed in order to elucidate the fluctuation of the Alaskan Stream Extension Water during the summers from 1963 to 1977. Tish warm and saline water mass prevailed from 1965 until 1969 and weakened after 1970. There was significand positive correlation between the fluctuation of average of the corrected monthly mean sea level of May and June and the fluctuation of the mean bottom temperature from 1963 to 1974 excluding 1968 and 1973 (r=0.76, P<0.02).