Macrodispersivity is a crucial parameter in analysis of solute transport in groundwater. In this study, we measured 900 vertical hydraulic conductivity(Kv) for floodplain deposits in the Weihe River, China. The Kv values were collected from a 30 by 30 grid (an area of 60m by 45m) using the standpipe method. The results show that the average Kv value of the floodplain deposits is 0.012cm/s, the median value is 0.006 cm/s, and the variance is 1.33, which means that the spatial variation of hydraulic conduc - tivities is notable. The statistical test indicates that these Kv values show a log-normal distribution. The exponential variograms were derived to analyze the spatial correlation of these Kv values. The macrodispersivity values were then calculated based on the spatial correlation scale and the variance of lnKv. The calculated longitudinal macrodispersivity for the whole study area is 21.27m, and the macrodespersivity values for individual rows within the grid area range from 2.11 to 4.65m.