The work aims to study the applicability of an epoxy Nano powder coating in an oilfield of Xinjiang and corrosion inhibitor technology. Three typical working conditions of coating in an oil field in Xinjiang were simulated by high temperature and high pressure autoclave, along with corrosion weight loss method, bonding force test, cathode stripping, scanning electron microscope, and AC impedance, etc. The morphology of epoxy nano-powder coating and its binding degree to the matrix were analyzed. The service life of the coating was predicted; and the effects of corrosion inhibitor on corrosion behavior of samples with uncoated, damaged and intact coatings were studied. The results showed that the bubbling and cracking did not present on the epoxy nano powder coating after corroded in three typical environments; and the coating was well combined with the substrate. The cathode stripping radius of epoxy nano powder coating was less than 5 mm; and the lifetime predicted by the cathode stripping radius and impedance values was 883 d and 740 d, respectively. The uniform corrosion and pitting rates of the damaged coating was 0.6172 mm/a and 1.5720 mm/a, respectively; while the corrosion rate of the complete coating was only 0.0029 mm/a; and the impedance value of the damaged coating was 103 times than that of the intact coating. And the corrosion rate of uncoated and damaged coating samples were reduced by one order of magnitude owing to the addition of the small amount of corrosion inhibitor; and their corrosion inhibition efficiency was 91.05% and 92.75%, respectively. Therefore, this epoxy nano powder coating has good corrosion resistance in three typical corrosion environments. Its anti - stripping ability is also good. The prediction life of stripping radius and impedance is basically consistent; while once the coating is damaged, the corrosion is more serious, especially pitting corrosion. The complementary advantages of different protective technologies can be achieved owing to the addition of small amount of corrosion inhibitor.