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In this study, the emission spectra of OH (A²Σ→X²Π, 0–0) emitted from the high-voltage pulsed corona discharge (HVPCD) of N₂ and H₂O mixture gas and humid air in a wire-plate reactor were successfully recorded against a severe electromagnetic interference coming from HVPCD at one atmosphere. The relative vibrational populations and the vibrational temperature of N₂ (C, v′) were determined. The emission spectra of the Δv=+1 (1–0, 2–1, 3–2, 4–3) vibration transition band of N₂ (C³Π_u→B³Π_g) is simulated through gauss distribution. The emission intensity of OH (A²Σ→X²Π, 0–0) has been exactly gotten by subtracting the emission intensity of the Δv=+1 vibration transition band of N₂ (C³Π_u→B³Π_g) from the overlapping spectra. The relative population of OH (A²Σ) has been obtained by the emission intensity of OH (A²Σ→X²Π, 0–0) and Einstein's transition probability. The influences of pulsed peak …