The work aims to study corrosion behavior of three common oilfield materials-N80, 45# and 20# steels in injected water of Jing 11 fault block of Huabei Oilfield. The ion content of injecting water was analyzed by ion chromatography. Corrosion law and mechanism of the three ordinary materials of steel pipe injected to water of Jing 11 fault block of Huabei Oilfield were studied by virtue of weight-loss method and electrochemical polarization curve tests. Moreover, morphology of the specimens before and after corrosion was recorded and analyzed. When the mass concentration of sodium carbonate injected to water was 1000 mg/L or 4000 mg/L, 45#, 20# and N80 demonstrated higher corrosion rate, and 45# specimen demonstrated maximum corrosion rate of 0.1322 mm/a. In addition, many obvious corrosion pits and a plenty of corrosion products were present on the surface of specimens. When the concentration of sodium carbonate was 12 000 mg/L or 20 000 mg/L, the corrosion rates of three specimens were very low and much lower than 0.076 mm/a, little corrosion product was produced on the surface of specimens. The corrosion is very serious when the additive amount of sodium carbonate injected to water is lower than 12 000 mg/L. The corrosion of pipe column is very slight and N80 steel demonstrates better corrosion resistance than 45# and 20# in the same corrosion environment when the additive amount of sodium carbonate is higher than 12 000 mg/L.