Abstract: In order to study the effect of artificial recharge on the groundwater quality, the evolvement law of groundwater quality in Western Daqing City was firstly studied by using inverse geochemistry simulation method. The results showed that the groundwater quality was affected by dissolve-precipitation of aquifer minerals, alternate adsorption of cation and redox function. The dominative mine-rals in aquifer are calcite, dolomite, halite, fluorite, gypsum, hematite, siderite, pyrolusite, carbon dioxide and cation exchanger. Based on the above work, a water-rock interaction case among Nenjiang River water,groundwater of Xi-waterwork and aquifer minerals in western Daqing City was studied through forward geochemistry simulation method. The results showed that the TDS of mixing water will decrease, the more surface water quantity in mixing water, the lower TDS of mixing water. The artificial recharge water will not lead to catastrophe or decrease of water quality in aquifer, and it will improve water quality in aquifer to some extent.

Key words: groundwater artificial recharge, groundwater quality, aquifer, geochemistry simulation