Based on the data obtained with a ground based dual channel microwave radiometer in Xining,Qinghai Province,during spring season in 1997,the total cloud water vapor(V) and cloud liquid water(L) are analyzed for different months and weather conditions.The results show that,for the specified weather conditions,the values of L increase gradually from March to May at a growth rate of 20-40% per month while the values of V have no significant variation.The cloud liquid water content is only about 1% of the water vapor content in the atmospheric column.Comparison of the observed data from the Tibetan Plateau with the data from Hebei Plain shows that there are no significant differences in the cloud liquid water content between these two areas,but the V over Xining is higher than that over Shijiazhuang by about 30%-50%.