Based on four-year observation of integrated water vapor and surface vapor concentration ρ0 on sunny days at Hefei station, the scale height H of the atmospheric water vapor was statistically analyzed.Results indicate that annual variation of H is obviously marked by summer(winter) the highest(lowest)value, and the discrepancy between spring and fall is feeble. The degree of correlation between mean seasonal values of H and mean seasonal values of ground air temperature is excellent. The diurnal variations of H exhibit two-trough shape for different seasonal classes, with maximal value at 16:00 and minimum value at 08：00 and 20：00, respectively. Mean hourly values of H are proved to having excellent negative correlation with mean hourly surface vapor concentrations ρ0 during 06：00～16：00.