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To develop the best management practice for agricultural land of sand dune area for sustainable crop production and conservation of surrounding environment, ground water quality is to be evaluated. The objective of the present study was to investigate the spatial and temporal variation of ground water quality in sand dune area of Tsugaru city in Aomori Prefecture, Japan. Three observation wells were installed with three plastic tubes to collect ground water of 2.0 m, 2.5 m and 3.0 m depth. Ground water samples were analysed for electrical conductivity (EC), pH, concentration of Fe, K, NO3-N, and PO4-P. Soil environment from 0.1 m through 3.0 m was also evaluated. The results showed that EC, pH, and K concentration in ground water were decreased with increasing depth throughout the investigation period whereas Fe concentration was increased. The ground water of the study area was found not suitable for sprinkler irrigation since concentration of Fe was more than 1.5 mg L-1. Average concentrations of NO3-N and PO4-P in ground water of the study area were 0.029 mg L-1 and 0.062 mg L-1, respectively. Soil environment at the depth of 0.1 m and 0.5 m always showed oxidized condition (oxidation-reduction potential >300 mv). On the other hand soil environment at the depth of 2.5 m and 3.0 m showed reduced condition (oxidation-reduction potential <300 mv) during the study period. Soil environment at 1.5 m depth was found oxidized in the month of April, July, September and October, and reduced in the month of May, June, August and November. This might be due to fluctuation of ground water level. Because of presence of very low concentration of NO3-N and PO4-P in ground water, there may not be any threat to human health and environment.