Abstract: In order to address the problem of severe corrosion of pipes and rods in oil wells in DC Block of Xingzichuan Oilfield, it is found that, through field investigation and sampling test, the main reason for corrosion of pipes and rods in oil wells in DC Block is the coaction of CO2, H2S and bacteria. In view of this main reason for such corrosion, the author developed the low-phosphonic solid corrosion inhibitor was developed through Lab experiments, optimized such additives as sulfur scavenger, CO2 neutralizer and bactericide, hence determined the formula of corrosion and scale inhibitor system; then dried and solidified the agents to obtain the solid corrosion/scale inhibiting tube. The tube was used in five wells in DC Block; the average corrosion rate of the produced fluid from the oil wells was reduced from 0.682 mm/a to 0.050 mm/a, and the total iron content was reduced from 2.4 mg/L to 0.4 mg/L, the maintenance-free period of the oil wells increased from 41 days to 210 days. Field application shows that this solid corrosion/scale inhibiting tube can effectively improve the corrosion of oil well pipes and rods, elongate the service life of the oil well pipes and rods and reduce the times of downhole services.