Aiming at the problem of oilfield reinjection water quality deterioration,the water injection process in field pipeline was simulated as an injection process in an experimental pipeline in the lab.The simulative experimental facility was designed in strict proportion to the field water injection pipeline.Water samples in different material pipelines were collected in the experiment,the relevant water quality indexes were determined and the elements of suspended solids in water samples were analyzed.The reasons of why reinjection water results in the corrosion of water injection pipelines and poor water quality were probed.The results show that pipeline corrosion influences greatly the amount of oil and total suspended solid contaiminants in reinjection water.Through the EDS analyses of suspended solids,the effect of pipeline corrosion products on reinjection water quality deterioration was discussed.It is concluded that pipeline corrosion is the main cause of reinjection water quality deterioration.