Abstract: This paper describes the distribution of uplift pressure beneath, concrete dams. The following main contents are included:1. In the first place, the general principle of uplift pressure distribution) the elementary concept of uplift coefficient α1 and useful area coefficient α2 are presented.2. In this paper, a number of examples of hydraulic engineerings are listed, and also we have collected and analysed sufficient datum of observation.3. According to the observation, theories and experiments, we have discussed influence of the blanket, grout curtain, the line of drains, the geologic conditions, and the types fo dams on uplift pressure.4. Based on the above-mentioned analyses and discussions, finally, reasonable suggestions for the measures of "prevention of seepage and drainage" and hypothetical uplift diagrams are derived.