Atrazine is an herbicide commonly used on summer maize throughout North China,where the growing period of summer maize coincides with the rainy season.It is,therefore,of great significance to protection of the shallow groundwater environment to assess leaching risk of atrazine at filed scale.In this study,with a small agricultural plot (27 m 27 m) at Yongledian Experimental Station,Tongzhou District,Beijing as background,soil samples were collected and analyzed for soil physicochmical propert ies and the meteorological data of the year of 2001 were gathered.On such a basis and the assumption of column model,numerical simulations of the spatial distribution of atrazine leached dynamics at field scale were conducted with spatial variability of the soil hydraulic parameters and the atrazine transport and adsorption parameters taken into account.And then geostatistical analysis was carried out of spatial variance structure of soil water negative pressure,water flux and atrazine concentration at 20 cm depth during the growing stage of summer maize.Results show that,variograms of the three variables during the summer maize growing season were basically spherical models,and most variograms had ranges about 8 to 10 m.This approach of the study can be used as reference in designing and laying out a monitoring network for water movement and atrazine transport at field scale.